Malicious PDF — malware analysis report

Static analysis result for SHA-256 a177a2d4fa551e41…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 14:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: affbf92a12c87394c1213d52ed2c846c SHA-1: efe20b14925cada1da86196901c8ff1bf0b29a72 SHA-256: a177a2d4fa551e4195e9555d9fd484df7d04ef99130260da5203e0e34eed8b35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised upload storage for hosting PDF files, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://riosemarescentrodemergulho.com/ckfinder/files/13352576327.pdf In PDF document text
    • http://93564497.com/userfiles/fumimogepolotozidozupekos.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/98817072728.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/sabezewimavesa.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161314b79f35f4---lebekekokaz.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/dadavibelivaferu.pdfIn PDF document text
    • http://gojjang.com/uploads/files/jumono.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/53651105846.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/negirekabezofiminojegu.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/gipobisisotuni.pdfIn PDF document text
    • http://runhouchem.com/upload/files/buzovudamitosakometun.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/tanipetalugefulufi.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/eitnh2pv6dpkcgvu2vt2r6j7vl/mujizugasiz.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/sizisupemuwenuvujeg.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gifovanafevonolifuruse.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/55634668450.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/selokinodizozafexibeloban.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/zawowazurupogokiseza.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/15003446887.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/xuwitirufozobofoguranol.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/nemutanimisas.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/66431256261.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/64b30e22af99d31e963aa1dc401ada8c/57268416326.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135e96d3d8a3---72898893228.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/59631931476.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/1575831238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=arrange+icons+alphabetically+androidPDF 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_off0000d870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF087 11028 bytes
SHA-256: bd32b3d7822cf50006995feea51ce2250a269a9d6c2ead6f6ccb334c22b06580
font_02_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 18776 bytes
SHA-256: d7abd4ecc656b10a42e409290997142872924d040641e813bee4bf9ace4cae17

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