Malicious PDF — malware analysis report

Static analysis result for SHA-256 491c139a792fe76f…

MALICIOUS

PDF

81.4 KB Created: 2021-07-24 18:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40f0f4751ce2f7bd3df74377baa4966e SHA-1: b1a38118dcc03315a95058a08850b43062087091 SHA-256: 491c139a792fe76f7ebb729de21bc1dfdc7b135bc3ac1fb23fca5791ec61cd3b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm pointing to compromised CMS uploads and potentially a password-protected archive lure. The embedded URLs suggest an attempt to redirect users to malicious content, possibly for phishing or malware delivery. No scripts were extracted, but the overall pattern suggests a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://noriupapildu.lt/ckfinder/userfiles/files/65740437074.pdf In PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/fisuregopeje.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/92bbe8cf81cc7b525d5fb76101bd28d9/sobimesodolaradofe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6bb48bcce---ludokatebebifafulozoxa.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6e339f1bea5b77160ca7e83410964a19/zamovuveledejobofaginuxiv.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/56801392413.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/nisuxulojunowax.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/iva0ighldthtenv60iecc261e7/10790083813.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b79e6ca1aad---kaliw.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/d0ff8e2bdde0cff8982b56407cbb477f/7236116821.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/h1kltuuj1noqdvf28ca5hu7nab/joxupibubarupawoj.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cjrs4eg9d532k12kk3r5mj70t0/giditumexavikimaluwerugo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd7f67e8291a7e23dacf2674cc424d74/forenefiwamimedopipu.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/2826088926.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/61bd1c4178ccc379c2b9808666d4000e/95351196392.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/46947467621.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/xapuzizazimexokasabunita.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/wulegewufomizuwarun.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/magewuwazerutezapolajibok.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/sawuresirazezuvuvevixe.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0527f1151---82630568836.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/dd1a15de7e60899d9598dd9a077e7375/getufaruda.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/mibakisaxeboxej.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/fdb5b412a907607fa9d1767e002b8323/75727112607.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab83250739a---pejuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=divertida+mente+filme+completo+dublado+downloadPDF 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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 19288 bytes
SHA-256: 2365a6311c2fc32d6ca6375c4c9e714143f72819b40ed157156e453fec17975e
font_01_sfnt_off0001035b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B72 11008 bytes
SHA-256: 872e3ed1e4b81c782a2ba0863ff71f9c2aee126ba3527fc758d139b091d8cda0

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