Malicious PDF — malware analysis report

Static analysis result for SHA-256 060104444bb9ca8f…

MALICIOUS

PDF

88.7 KB Created: 2021-07-05 07:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f38f854a4510b5d0aaa7dd672b439d3 SHA-1: e344a5380a6a89a100b42c25d4e52b26c09b7a5b SHA-256: 060104444bb9ca8f9eb9b42a312759b6c8f1b089161fad8d4b0613226d60c70a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd27c1cda8---japapemawofewefufedem.pdf
    • http://www.alcera.ca/userfiles/file/45062813910.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8740a6bb37---gemufonorapinajal.pdf
    • http://tipiland.net/upload/file/jefexatozoridotagofisoxo.pdf
    • http://poslovniimenik.net/firme_data/files/fifumewipevenerililodoba.pdf
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/17862746382.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/1bb6fea2f005b6bb41f8592e945d8a95/dajodazin.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/71e96055b8340e30b8f869b441f98ec6/16530399975.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc88e304d5---22615689219.pdf
    • http://szao-spb.ru/images/news/file/21618775246.pdf
    • http://aven.su/userfiles/file/nojewujinupajaw.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c973ea82e---lenojesexixi.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/734b0c529e0074cc8b9f41d8dc22a298/49264298374.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/23664979525.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7540sbfip7juhibcbi4qj5atlg/mudukajomasusuxumudiwenuj.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fabbc0dc19---sonane.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/adc38002fa12581193016b676282c6bc/ruluxitajolizakosame.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/larixuranite.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/770365a6225914e03ce9a498fcafb976/27434882079.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ebd42dd3---88357351937.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/0kr9n39gdrmf0pngaip4jvmtdk/17608491165.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/c6o9jdj1784ljd2caetn3rjg7f/dezupidi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dissociative+mechanism+in+ligand+substitution+reaction
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0a912158dea24f9e00e325d54846d9c4/51620631147.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_off0000f4c5.bin
fdf6f5903dcfe6140ca6a244af26dd37684f2e22c48a0db2fc52dd2a91ca51b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 17480 bytes
font_01_sfnt_off0001231e.bin
31aec781cc13691563b9d09a793d21e9082a17ef5f28778879bcf8dc34829180
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 11124 bytes
font_02_sfnt_off00013cb9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB9 16792 bytes