Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98e223c10f14023…

MALICIOUS

PDF

77.0 KB Created: 2021-07-16 11:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6c43e6227db54162f1606af806399c31 SHA-1: 0f2f4eca1c53c952b7043098875cd617553cc961 SHA-256: c98e223c10f1402356c7445dc4a2faf999ac550854a11acf75876a62d8a1715a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, including one hosted on a compromised WordPress site. The presence of numerous links, some with UTM parameters, suggests an attempt to lure users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://infrive.ru/uplcv?utm_term=the+hobbit+the+desolation+of+smaug+free
    • http://www.armstrongre.com/files/files/majisaretutul.pdf
    • http://askort.pl/Upload/file/bivejiwevetabulupup.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b510864294---zezuzozixanoxorudedazak.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/0c9d0935fb62738577a32d1f23bb3121/timos.pdf
    • http://3dprofi.net/images/uploads/file/direfisobuvesuze.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/8daac59d0ee33f553bfcb602a6e79d7f/riwivubatajatotepob.pdf
    • http://misosmile.com/upload/editor/files/48475289893.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdc5f51342---87765427451.pdf
    • http://faradtvandor.hu/picture/userfiles/file/79865409336.pdf
    • https://chp-travel.ir/data/file/wafitakudunuxebewo.pdf
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/52680694724.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/vekiberalibemogofonolom.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/febc93c3ccd7f1ed036672d73954d4a9/kojifi.pdf
    • https://vnsteeldetailing.com/UserFiles/files/teguvaxukatos.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bac2bfd58cf---xazusirimopimuk.pdf
    • http://hytechplus.com/userfiles/file/xosuduwafapakuxopudok.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea74f5e940---9521622159.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099e8d94f04e---66688122720.pdf
    • http://abwsalisbury.com/uploads/files/92265149698.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ed2e4c961e30b2ab997a786867cbb5ed/diwoxabadipe.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd5ffed347---32312984104.pdf
    • http://thechelseaff.com/user_uploads/files/tuzolewifurewedulejetof.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_off0000ca49.bin
44da6982123c5d94c76b9cd0db9cfe1ab06c3b5790a123d302b28f8c6793dcd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA49 11004 bytes
font_01_sfnt_off0000e363.bin
3416886d42c04dd3bcab6ece9cba8160afee8a7d2a5742ced218cb5456831dcf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 16564 bytes
font_02_sfnt_off00010eb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16792 bytes