Malicious PDF — malware analysis report

Static analysis result for SHA-256 af78905a5b763e51…

MALICIOUS

PDF

94.4 KB Created: 2021-06-28 08:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9df8fff2a84b970078d7682c147a33cd SHA-1: e959a9ffd378804463a3fd8d567201aa055a6f27 SHA-256: af78905a5b763e51146dbf6cae2bc199b4f1d00a3e99b9df3086eba613406eea
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. This structure, combined with ClamAV detection and ML flagging, strongly suggests a phishing or malware distribution campaign. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to create a link farm for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rdgoq21hldf0tiq49gam9ke48h/wavujimefukug.pdf In PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aajnejboe2fv8fnroteq7t59d7/gezuvage.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/29690870249.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1ff70339---nidavobalaja.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/rudojajajufovutinixapep.pdfIn PDF document text
    • http://indecomavo.pl/inc/pesatorazugolofuliza.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/gubesebobopurezajo.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/tpvmki7i0svft9uc4rgl5vcp0q/lawubabisi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b1e1f75e---varorekuzukone.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jbvei619o0su6ma9onbjt11ftsgv42df/74467619766.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/964f2f593df9dbbd64c324c0a94e4867/wotasiminofadavevokural.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78f53b8da---perikoju.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bdc7f7ba---wipep.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5e6b48ee3---dexezuvu.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/repalafepavamazegila.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/lct1qt9arjqt1o3tj3404k5tfd/64951760625.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097ebe2c6170---bitazuwupe.pdfIn PDF document text
    • http://apvn.info/userfiles/file/fomafutubemetazavig.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c741ed7cd3---46426552987.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0f8be0b7---2422649060.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/42087467841.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c7d8c1ac1b9c7e9dbd077ca883a336fe/zobabugosadutuvexigu.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/15636816057.pdfPDF link annotation
    • http://vodnik48.ru/content/file/xixowufeginire.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9802e724---7170513733.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/9a6bcef3628dd5d409a8bca23d5cbbc0/93173082360.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/o551gio1ha68tbsak0rltl43co/butametimamomixano.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=acrylic+painting+of+lord+krishnaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10952 bytes
SHA-256: d573eb2ea58ce810ae5f2b91093a7715edb74102005e64cb7ccfc2e27bc2206f
font_01_sfnt_off000128d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D3 16552 bytes
SHA-256: f45292bc82d5736d659539bb25dbafaeddb75a196bd2a08a983a799610971a92
font_02_sfnt_off000153d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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