Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a5c1875b790350…

MALICIOUS

PDF

99.9 KB Created: 2021-07-17 09:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1907e9c91c768c12abeb176cf0259b16 SHA-1: a6bbfc9596a8cd67cb303dba649553b188254e76 SHA-256: e3a5c1875b79035067c0f9ff3d7f5de05697280fe4fcfdfad8b6bb3cb43d5f23
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5fc84dc9661167f6aa5e30cee828d430/19438041121.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebde7a9aad---titifudalomejojilaxo.pdfIn PDF document text
    • http://nfc.soo.jp/file/31085743203.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/lofure.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b73a3747b---66866089272.pdfIn PDF document text
    • http://1careglobal.com/upload/files/jagegew.pdfIn PDF document text
    • http://pneusmarene.it/images/file/20308931468.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b58281beb9---33154475130.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/sewidepevumovixuvexaga.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/62039069385.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/buziwumisumezufilup.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a3b3d9c0---44361369527.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a296649a25---94079428927.pdfIn PDF document text
    • https://puppometalli.eu/file/46415673968.pdfIn PDF document text
    • http://burchiellati.com./file_fck/file/risojipupopemejivazo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c66c14901e---6809129172.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/kuzezamopi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/56eb3d7e5218f151cae604e34bb8c966/13761114041.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a14ecdb51ba---tedipowafu.pdfIn PDF document text
    • http://gabortech.comadmin/file/3285404799.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/gukew.pdfIn PDF document text
    • https://maisonforville.be/documents/file/pubokarusofenopetanifuri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kylie+and+khloePDF 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_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 10176 bytes
SHA-256: 80a7a000e589a949717f796360dc4a918be377b6b268142756d1f42480f3e0af
font_01_sfnt_off00013afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001530f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1530F 17688 bytes
SHA-256: 32ee748e96f782b957a0a7b601ec3f81c029e03c79769e629f98efc8bcd6b288

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