Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10257a55961e074…

MALICIOUS

PDF

79.4 KB Created: 2021-09-11 21:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2bac6526b5439bffa0f62137e1da9447 SHA-1: 4e834ecf7bb51713e6589e306ebe95c1ad27f9fa SHA-256: b10257a55961e074bc4e3c915199ed70ddc181072ae51e8708508c82042c0af2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm designed to lure users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://gruppocreta.com/userfiles/files/duwipodukofizov.pdf In PDF document text
    • http://tucholainfo.pl/userfiles/file/jofipavemebazuxesix.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ade77845---5443615169.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613863ad2d5f2---1296951265.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/47219062481.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/21177696688.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/sokixakuviwuvexadojifudi.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/rinufavavoliluvipovariti.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906212333.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0c170b4f4---11464936916.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/69100712424.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613870453993b---76307068639.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/7938919980.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/75917495655.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/dumatiminizogozotetosod.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/27071710806.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/moxasepuzew.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/wanal.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/42439230045.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/tiboku.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/satixadukepinanija.pdfIn PDF document text
    • http://surausa.com/uploads/files/nugefalaxevegagirupuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mobile+mouse+pro+apk+free+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_off0000d20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 10972 bytes
SHA-256: 8693599a3ceb205098e1dd369f87918606edc5a2a0fc7fd0b1145e089f48615f
font_02_sfnt_off0001035f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035F 17500 bytes
SHA-256: c32c0ba2ffc8f75ba95cc919ff71d8250d5b08a869ea86b79f6ec266aa8f6aca