Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfdb72b9b639736…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 23:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6905a7b36273196303295907f7a03e59 SHA-1: e85cb51fd02b9838c00907dac7469920a4149a03 SHA-256: 7cfdb72b9b63973614a0ad933374dc3ae802bef3435fbc14730f99fe5939cc90
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload directories and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The PDF structure and embedded links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/17c511ff2ab27f335357f3cfc11eba5c/rerazetugotigonitamoboner.pdf In PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/63438872452.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/90201252959.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/tkct6kfs7limsu99utvu45pdf0/45948053648.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/97015758737.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/bimod.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/35778104332.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/fegusunuzutofubuj.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/4a92ea432efd90c704c14fdd8856b0b1/sefobebugim.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6a3108d18---16650409003.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/34583904108.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eda3c1e29123e248b3eb4acb9e0fe2e0/70794373554.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/raxozolupo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2e2ad9273---52300769008.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/eee3496b2e936010a39fdfdce764d521/ginogisumajev.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/42623315510.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608521bc708b5---jizijawowex.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/lobibutazutubujavonug.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/tutuderinejoga.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/hhsjc6fmg4ndfc1jcqfhiqopog/fegibudavotonojijefaru.pdfIn PDF document text
    • https://ferropula.hr/files/rebawefip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rolling+db+tricep+extensionPDF 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_off0000dfb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB6 18432 bytes
SHA-256: bd3be049aa432066d645b535d0341d60ef184c9aaaa280d89f7417298276239c
font_01_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 10812 bytes
SHA-256: 4b0717e8952c58c79303c9cf82d6e9bdfdd09c1f3823cc7aaebe8caa4b1b642c

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