Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04daf40d9379774…

MALICIOUS

PDF

86.4 KB Created: 2021-07-06 01:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11d884abae857a3e4ad023d02872523a SHA-1: 7bfc26b8463bd40b9454d42e04b06bf760f101c2 SHA-256: c04daf40d9379774882cda9d9ae8ced4573030857ed71b3f36219b9e5523fb5c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further payloads or submit credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://srtprogetti.eu/userfiles/files/95536028275.pdf In PDF document text
    • http://akcjonariusz.com/UserFiles/file/fovamofebesom.pdfIn PDF document text
    • http://gyobel.it/public/file/43970388181.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b145c32b9abd1a1bf908f4aa116f5e6f/pidokakafan.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/487f1d9bcc02a1fbb3897b14cf3c91c9/51639207985.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/41a1b8d50fc487a2e3d7ed832b609c63/gufadipuvikova.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ef22c043179b00db85d74e7fd62eac44/majedumezofakuduxof.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4c46c59d9---44776667319.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/76796222860.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/ga7seh55rla8m3pfcb551qnbup/97257745157.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7e0570d11---zewet.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/suporapurorodozomonem.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/derixupimi.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/vatujawi.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/1700192447.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/dck7iisb1in50b4jekp7e4sse7/disufijotaxotagewokimif.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/7339434882.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/lugerukujameloda.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/62073354325.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086636ee96be---jodaledit.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/lufololoxomo.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/zagunitevizifoka.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/ganun.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/08b79fa1224cd3656c3ab692aaa8980c/pizumidonadirujuzenu.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/29705589971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+use+bane+of+arthropods+in+minecraftPDF 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_off0000eef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 16704 bytes
SHA-256: 8d984c0457c36aa344eb73c0038c304fe4bef9177aa0412c5ba1b3b33d170827
font_02_sfnt_off00013276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13276 11156 bytes
SHA-256: cf3bab7cb6428163100cff4610f412fb45470853b7f2b5bebb4c8122d7bee8b5