Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aaf3aef06c955b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-02 04:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8934c1f57cf22ba85bf2385bfab04096 SHA-1: 26686d793866411948a315f3d2629c641d15d022 SHA-256: 36aaf3aef06c955bb8f9ba0908c07440324efeab1842525138b3bb8bc5aee6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://standardpromotion.com/images/upload/userfiles/files/zodamowetidujukilurogele.pdf In PDF document text
    • http://njbeihang.com/uploadfile/file///2021083107515632.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/lados.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/87251063804.pdfIn PDF document text
    • http://montrealinkwell.com/clients/c/c4/c478fb9048b4d856ed1aa16e2301f982/File/21052564209.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd5e6665f4---sawesabomir.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/q8molcobqimn2l050mh0gakfh2/46693080130.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/75360c2fda01e14d32ef37f72aee830e/37514660393.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/7ad8cc97ce942e9ec82ecbadae9e8666/1165642193.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bakijun.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/66213306156.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/sukisarekakazabuza.pdfIn PDF document text
    • https://htchninc.com/d/files/gujoresotedo.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/79427138703.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d787e15f7f---sezibatanadokasepuzu.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0h1mrl6eem8fi5vnfgvqom4rce/xagatapivemad.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/28526315325.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/29831861161.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/44489256426.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2riutea93pcpejtpi6q0fkombq/27190220604.pdfIn PDF document text
    • https://morabia.fi/images/file/27978114773.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16129e04b241c7---83316918096.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/b9p684raobhd9st7luq1cehek1/suxaxabekimawikororilowir.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/3aa47d069697184e67620f82ef5e6063/kusokanixafozawovuviwa.pdfIn PDF document text
    • http://platcometals.com/images/file/44414440069.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/c4m9h2gkjau05lktuko7b18gka/veketawumufoxoxesojote.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bomitisilajiwajogim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=equity+research+analystPDF 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_off0000dcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAC 16404 bytes
SHA-256: 1c03c8a15f269e57d4577262e5d4c02d2db449feccee3d6c018c2654e4fe8dfa
font_01_sfnt_off00010701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10701 10552 bytes
SHA-256: 6610fb50593caf5e3f5455ae55054fbf6c4c92101841a142be45b6bed3ec716b
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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