Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8107425816d797…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 04:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c0606fa9fef1b8684e81b26babd0caf SHA-1: 5036c2caa781a3b66cef4854cc45a944cd801cf0 SHA-256: ad8107425816d79781c9631ec6d2decd1724357d1f086dca0ee3f233a1e48d35
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link to a compromised WordPress upload directory further supports this. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://circolonauticofavignana.it/userfiles/files/rozufaronolovuzavipowem.pdf In PDF document text
    • https://turbooto.vn/upload/files/17774713674.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6gbgi5ba9am3d5mar3a1rfe9o2/74557493005.pdfIn PDF document text
    • http://cl-pub.com/files/files/pagixobe.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/14802561001.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/zuvijenivezuzibo.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/gevukike.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4287b65432---1944610513.pdfIn PDF document text
    • http://robbes.nl/media/files/papazaxexoxuvume.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114fedb96afe---8389747377.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/duwobij.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/88160696888.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826159c9c25---punujelimasesanopevew.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/65279192057.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d9acfa08---27159070670.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b167c70d7---xipatotanavuse.pdfIn PDF document text
    • http://freetds.net/userfiles/file/jodevabatetabu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/cfda15cbe9745eceb438dc0b0a9e0145/93243986347.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/xuzedepobafiwufudokagabi.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/sujabamuludebufasufox.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/sonobiwavogameponebolesiw.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/49f7b2cd03dba366b37b314502782217/92085792921.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/07347fd72ca0659946e011553d20c08c/43556946284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hornady+reloading+manual+10th+edition+for+salePDF 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_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 18808 bytes
SHA-256: 596c2bf060f03f5b52b065e7f7057c7a58af05e5f654834d3fef9a275756a52e
font_01_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12521 11180 bytes
SHA-256: 0d12cb3476e76b32c2fad5513f17c6dbacc23ec280ae893f206cfb5729bc6812

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