Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bdadd4bc3127bb…

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 04:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 768a6e9ff23b34ca2dd341d75fe5f2f2 SHA-1: d163683250fc71c0e93fb393faeab19fc190a191 SHA-256: f2bdadd4bc3127bbc26f528cc940d9a910eb1dcb141a1d210e801015a2dedc3a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous links to PDF files hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing attempt aimed at tricking users into calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802a1a695c6---50189353822.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1b0bc1b9d---mijokosixika.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/rnaurd5rbtpgnbski4bojqnkp3/57384904013.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb307b3f0b8---39129327937.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5c5fc3f3b---71474683409.pdf
    • http://tgtech-auto.com/userfiles/file/bazidixapezebeginizisik.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0c231366a430d0f5580e8a94c634fb9d/fafujetutasekobowetojob.pdf
    • https://faresaldabbous.com/uploads/files/66310109633.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c63a3e3a38b---xisubizo.pdf
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jexawovune.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608abae60c5d5---sikeritasulawuzozubesagiv.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1d89a8ee43a9fec4575978994c93eae0/rumebutigusifad.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ecdcb1de---74422833864.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/6jkhda7ub3bv0e02h4l0trg56j/51033647691.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/qv84gbb2e9311b8lhtodn22r1e/ralakudesewu.pdf
    • https://apotekatia.ba/fajlovi/55120100735.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7473092553---luligorisosirexamep.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd35ee23299---52234045287.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/q55u893408f37rqb2cp7q3vee0/safubeda.pdf
    • http://forter.vn/hinhanh/file/96236678672.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bfb899850---3254923810.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ca18175f---93360391323.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160726ae88e172---67752022315.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=travel+to+lundy
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef48.bin
ae55315803e53ff6d175924e4d7e9ae7ae11ded2fc2e083936d0437ea85a2c29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 17284 bytes
font_01_sfnt_off00011cc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
font_02_sfnt_off000134d8.bin
9c53039036a6f0defa89bb48bbfcd2d5eb2a627be620335e5508503b8a776296		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 17196 bytes
font_03_sfnt_off00014d9a.bin
14261d3db8c7f0db51a91ff527976c87f694d1caca7a77f1b3eb7595af4324fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9A 10224 bytes

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