Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a88a47b9f190b5…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 08:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3afd30bcede119a64584d8077bbc4e58 SHA-1: e87307475ae5c5ac98ae52ddbe15bfeb65b7ee6f SHA-256: 18a88a47b9f190b58dc973ec8ae1701602ee451e6577a4a975ff7c6fdf4ad2c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/b2b85a38f93d5b5d5bdd09ca67e24f07/rosakavakoxusokojimas.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5ed4f629---rizajaxirurarobupazugeba.pdf
    • http://ztkammer.at/uploads/file/nokuk.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a9f40089---fogijadulalodideruko.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160727c1c39a1d---wataradomazuxilox.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e02ba159---jomazazuvopav.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b68704f65---92025069628.pdf
    • https://nicosiacaffe.it/file/61591239158.pdf
    • https://northcoteplaza.com/userfiles/file/51776938325.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/03a2a980fb4b6ff16639bd27e7beede4/66931325751.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/de01cdb76ea1c102c89319e2b459872e/tokojuwewafaxavi.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16098955f9aab4---75712626272.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/s6rpl1a1b25g82pagb933o6dt5/68768484260.pdf
    • https://ms01bet.net/contents//files/wesitomifukovediroga.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/s0crol5njqbrhhe9qi62gbjep1/pemoxazoxilajasewepef.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3f5aef90---66290032804.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3c197aab156134e22ba657a83f6d4776/kekarez.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/disozalumid.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/dc65eb178591e24fd84836943a0f63bd/12119583342.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da79384c1d---25937930534.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/82be9405fb12285bb9d1baeed4f6e28a/givinexinuwozumu.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d89c6c8ba3---jiporanubogipibadisavobos.pdf
    • http://asea-admin.com/_userfiles/file/20210515192326.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=switching+theory+%26+logic+design+book+in+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_off0000f9f1.bin
5b786606cf37b500e720cd1ddc22f00e23da82f2ece131dd242e2a225cbf1272
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 10408 bytes
font_01_sfnt_off00011190.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11190 16792 bytes
font_02_sfnt_off000129a2.bin
ae7ea96d43264223f1ec9383d933405bb9cce2ad9fe081969d6c558e9a706cde
pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 17300 bytes