Malicious PDF — malware analysis report

Static analysis result for SHA-256 abaf912366b571f1…

MALICIOUS

PDF

90.4 KB Created: 2021-10-17 07:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35a48da56aee849977ee09c37bac1f63 SHA-1: fb82abbd25d4348e8dce7b290eab486c9738f6c3 SHA-256: abaf912366b571f1e9e49157c15dfdea1806e6d4f14734b63ab575c45f509a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://capital-publishing.com/ckfinder/userfiles/files/pefurusumukigekosotaj.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e596b9c76---sananidipoxaxexa.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f8d8ffefa986417cb51fe225e8fa1f1d/vokulobafapogufoj.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f3548ae7e6f88c9e34505f9ca681236/28383583804.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/87290718908.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/xedom.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/riruvisixupava.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/19156485419.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__615DACCBC6611.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/vuxibo.pdfIn PDF document text
    • https://etimes.mn/uploads/files/19621899504.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d84bbe2ae690c7c01cad3229e617fa92/37064874904.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/rowakekorur.pdfIn PDF document text
    • http://absoger.bmv-communication.fr/uploads/files/rigiziforozibemexu.pdfIn PDF document text
    • https://sapporopools.com/contents/files/kogedijabak.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/sulusedem.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/nuzotu.pdfIn PDF document text
    • http://thekkadyinfo.com/userfiles/file/judoxubomu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161628ccddc499---68689882311.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/18478670573.pdfIn PDF document text
    • http://bdn10.cz/files/file/21727871884.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/tidelidili.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/lejegowiludox.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/59784893828.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/kerab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/4dZi1sgP-vI/uplcv?utm_term=watch+young+justice+online+season+3PDF 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_off0000f9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EF 18868 bytes
SHA-256: fbd105c070e804abe1f40392494271adc5c05f1a6b7cf8623d59105301ebdf26
font_01_sfnt_off00012a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001424f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424F 10920 bytes
SHA-256: 7535f024ae6aeec6944991dcc22b9e6b49c1b94dcd63ece04655e4d22dfbb537

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