Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c1a953e57536eb…

MALICIOUS

PDF

83.5 KB Created: 2021-07-07 04:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7fce3d51f383039e91b5414f424aee66 SHA-1: 42052574db69a8655bf1045135eb03e6005ece97 SHA-256: a6c1a953e57536eb590d4c87f71b36f228f777ddbc294da9229229fe90af1494
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern observed is the use of a link farm to redirect users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://cytairtool.com/test/userfiles/file/20210618_2c554.pdf In PDF document text
    • http://bbu.vn/Images_upload/files/xugubofutubonepusedupisub.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/7c0608a7a3ad7521b969c97bfe238443/xewubib.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/02825fa9602cf770de9905ee7fba12bd/28477996799.pdfIn PDF document text
    • https://xistenze.com/files/files/kupulupirab.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/puzagologazerixofix.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dumajemidaguxaxa.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/87503087101.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3bd0041ce4abacc67e742316e476bd09/naxejivoziwujibaxekaw.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/73818535156.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/mevisumugoxiw.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fe009ef59c5299095a333a8c58094552/55724594570.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3b587f4b7ab9af3e78820dc61f2ba228/86901425530.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/561b70592508e51ade9f88f381f8af74/78365259611.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/9981379799.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/mutevoborasomepidumaberom.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/58281201e159a380fca6bcd50ac54c42/lazufoletoniralufozom.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/d30uvvhubvn023d19huvactqm0/kedalusosave.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/29cb357a2776ccdee713fbb8d5c0dba5/jenidodegogoxe.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dcecf8fc81---latanemes.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/aa1a7sk8jdbsep6pi4i2493js7/645522127.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160790e76b648f---xusub.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cca3e7603---35011306606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=another+word+for+acquittedPDF 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_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 10672 bytes
SHA-256: 06e70387f79b3b79e57eb5815879d82e8a451fb0cb8b0c6e1f5a39aade4ab267
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 18216 bytes
SHA-256: 490f3546128a10052c341f8fdf807999e840aadfcca1a0bb0735dd2abc6e7e32
font_02_sfnt_off000128e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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