Malicious PDF — malware analysis report

Static analysis result for SHA-256 46618bf284d9631f…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 02:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77918ca297559b69c38605ff43bc7427 SHA-1: 24d4bbedae280dcd366c80758c7d5f6b3be2e065 SHA-256: 46618bf284d9631f0b0874f392bb4baeb0387c75ddbb6d3c9211a418f160824a
196 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into believing they need a password to access an archive, which is a common lure for phishing or malware delivery. Numerous URLs extracted from the document point to compromised CMS uploads and link farms, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://seikai.jp/free_images/files/nejapibovimivat.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/cps7lrqk7l3soikaf5pmputn56/xetogax.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd71666c6---18946930820.pdf
    • http://martonelektro.hu/files/file/92899472786.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0d5e35a8---lapalivunamezixunokuzare.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/64167836816.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f8530dfc2e984763cf26e9c7feecc2e2/53334068958.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bsbdquulopeosg3kvdq3mjge3q/44106729587.pdf
    • http://traiteur-ribot.fr/userfiles/file/73087239524.pdf
    • http://jagdrevier.hu/upload/images/file/momerojaxora.pdf
    • https://rt-totaalafbouw.nl/userfiles/file/31620461680.pdf
    • https://kultmotor.hu/images/files/24575572151.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087805fa74c9---32683243962.pdf
    • http://aeronautike.com/userfiles/file/10991579252.pdf
    • http://bukharaalpharetta.com/sites/default/files/file/42196710872.pdf
    • https://ludifrance.fr/userfiles/file/posajavuzukeduwupejuw.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa046100bf---xadapiraminixewu.pdf
    • https://jyapa.com/jhuoyue/uploadfiles/62193013040.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/53939866852.pdf
    • https://allcreaturesinc.com/files/files/tuvoxojuxanubopegodivug.pdf
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/331sev9ugvlaqngj78apea6nn6/jumevitagawusetitozo.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e9289bf3218---lumejojelesiz.pdf
    • https://aawyx.com/sites/default/imageuser/file/72388226833.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=reduire+la+taille+d4un+fichier+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff8a.bin
744c99ca5652f7b6cde464ad639df4650a60857d72c0eb0a541d63d071b86405
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 10652 bytes
font_01_sfnt_off000117d3.bin
9174ada35a76fb2ce7a474876773fb2fb49a1f54bab24d1b221e248c33396598
pdf-font-stream PDF embedded font (sfnt) at offset 0x117D3 20072 bytes
font_02_sfnt_off00014a37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A37 16792 bytes