Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d97b3a9dc6da6f2…

MALICIOUS

PDF

116.1 KB Created: 2021-08-10 07:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75559db4a36300b73273b3f5a1a69bad SHA-1: 114baccd0f99e9c0cb0daa176e332f4e100155ad SHA-256: 3d97b3a9dc6da6f236cdeb3c22fe771828a6fceadb9d72077a111449c0ce2a65
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to other PDF files hosted on compromised WordPress sites. The presence of multiple external URIs and link farms suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery. No scripts were extracted from this sample, but the overall structure points to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/mfha7elc9fnfi3jdefc52kih8v/jomonegigisupilidijoxu.pdf In PDF document text
    • https://lesfeesdelhetre.fr/upload/files/nerokesiperiwotatepalise.pdfIn PDF document text
    • https://wrd13.com/force/file/budepogikej.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/mugirelaluza.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4f30f2fc01431619b86795f945ec297e/zowifulawazanelujelemo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae52d5496a0---migixoniwavufuganorunofa.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ur890mp4cjbdu6pmvl7mfkcbo6/redokaginaz.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/24599075629.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/puwamalenuvinisifanudofe.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/24814560122.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8396e4930---36251253140.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085517f12878---pizina.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/vinesejivazo.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/9ba2db9f94b05c8c8325014f2d7de062/japarakaxupenadokevikip.pdfIn PDF document text
    • http://mopron.ru/upload/files/wirakibuvafataxivuvav.pdfIn PDF document text
    • https://comfort8889.com/upload/files/67906788337.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/r96sn67ifdnb134jm88si5g9ib/wogafadewotisigulejofoba.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ua1nq7k7lpoa25gd6p9une2rj1/gezube.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/87c01154ac0c5a7a5984ecfa7977e5b0/72812297937.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ledolakurimixozusetikaw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779e474567b---fudiwanebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=my+cart+center.com+reviewsPDF 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_off000163f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C10 10668 bytes
SHA-256: 15368406c9b38648ac653258ec29c93c5882c33fa488785f1b8baa11cfa5ca44
font_02_sfnt_off0001949c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1949C 17612 bytes
SHA-256: e75ea52713a6a1d63eb0ef555c723e260acd68c3a966c519b09d714aab5e89ce

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