Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef1c0f43aa32b1e9…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 02:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4611987980f3e0df834133f3950c4c95 SHA-1: 806ba79b72b24df7e8b30cfb1ca879452830ae86 SHA-256: ef1c0f43aa32b1e9c83fe5f3ca5310f4c0531253d1c16c68b3d7f84f60d17217
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332a17eb06---zabepet.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af32ea991d---10682823626.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/1ht3dh0snff0lof5kp9b1svct1/44893171633.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/91148326664.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/32541311708.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/komebusujok.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/moresazatulisone.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210907175905.pdfIn PDF document text
    • https://langumeistras.lt/i/File/98538554227.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/juvotadu.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/suzam.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/83245644984.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/gabidozo.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/43862206945.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/27301163407.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/91753733342.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/dusep.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/nuxafexuredizopix.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/tomekiripikukobutoni.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333bfad14fd---21248970263.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69181870725.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/67001427496.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/6422360459.pdfIn PDF document text
    • http://greenld.com/userfiles/3770538720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+wifi+security+alertPDF 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_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 10752 bytes
SHA-256: dfc81524c0e8e203c69c60529790674c21a03a963c4a599ab933ffc47a9e58b6
font_01_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 16988 bytes
SHA-256: ef8a88a7a5f7d9f7c4f3f045a096406dd0865435ef2726b1fd90589d437a9a68
font_02_sfnt_off00012f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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