Malicious PDF — malware analysis report

Static analysis result for SHA-256 734c630c5b73f05f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 15:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1dbdb0fb5f8bfefa41d069dc613e166 SHA-1: d3ed97996b67de6d2b69759e47ab001d9ae19a07 SHA-256: 734c630c5b73f05fb8b7cbb604bbf4787bdae92e51c2900bc8c052fa6accb84a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it contains a link farm pointing to multiple compromised or disposable hosting sites, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ahrestygz.com/userfiles/files/20210626_155732.pdf In PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/33296759421.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612c2ea7cb104---42689109213.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/xivavapikezava.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/fudil.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/29152743692.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/49bfe28df38118371adc0f4f51782bd6/14993019309.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077100f49f84---55260308841.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/nuzuxidefelar.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/121f0b1e9778747dee5f57214ad15b83/japajev.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/97358199765.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ba6299fc448b388a5d14f4d4ae12d203/13234396289.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16071f913ebaf2---sexitavunazem.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940950b66e6---kiduboxugorenota.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/boxufepuwobisunikubapodul.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/e2entfm6ouh31cdmksvdhi5fg7/54548811924.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/jejujasoxawomajiwozopube.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/26836267679.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/43105172777.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/88033442631.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/46830928390.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608194517d5ae---mituguvifukow.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/060c9b21a5f66bd2a62d79698df9c481/32388412886.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/5835593355.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c85afd048d6---dunafatiretumezede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=sadlier+vocabulary+workshop+level+b+unit+9+pdfPDF 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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 19156 bytes
SHA-256: c209c90673811f88142836932c561a3dfe6612c660dde805b66e6fc6715a40ff
font_01_sfnt_off00010f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 11560 bytes
SHA-256: 525369766654604ad9544ca93a312f88529d8348889a8f12436ff4d08fbd84a6