Malicious PDF — malware analysis report

Static analysis result for SHA-256 32857db454832968…

MALICIOUS

PDF

112.1 KB Created: 2021-07-14 10:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b183f64bd05b2d45577ae2dda07d061 SHA-1: 2b57c5b26015aa8e244da8f700667942b11d96b2 SHA-256: 32857db45483296895000df40b399f470d0f4fb304d09f2fbb86f1e23b0e7a90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and URL patterns are commonly associated with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986f7d442f4---satoxuxakojamabu.pdf
    • http://musicpark-live.de/userfiles/file/wetekubaxedixasupeb.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/9d71hh2qq49i3bmc50aqt8krr3/72924406775.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qvk840aco0gm3dt9sbr0r7k314/tidinatabupakesosoduxubub.pdf
    • http://weberstellen.ch/userfiles/file/41946590881.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62e83f735---81135063748.pdf
    • http://chinoboxingclub.com/clients/36032/File/39166263543.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4c3af348c153dff7dc20d68acc562f23/nonezurijusojubokuju.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d570f137---lixarulisun.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d485fc510c0---baxovasenok.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608621c997f8d---57283764152.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/0q4ruse9j5ppth2a5b5kqsjmj3/jaxemonujumo.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb02ed3e43b---27998306406.pdf
    • http://xinyuemu.net/assets/202106/files/20210630105100250765.pdf
    • http://joy05.com/_UploadFile/Images/file/vupulipimuxavinin.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/22327e3bbdbc21c4e4428c7e331d1909/kunulorinenimewozit.pdf
    • https://grupo-kayros.com/userfiles/file/36329742394.pdf
    • https://hosvagyok.hu/userfiles/file/bimuxofopagi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795a2aec5cc---kekuxolarulitepejix.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0flo00sa84h1dr2lgaesoetgkb/78527422926.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/xisejodiwoxi.pdf
    • http://tlxzkj.com/uploads/file/310158528964.pdf
    • https://atcotourismtravel.com/userfiles/file/zezagetu.pdf
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/lovaxomixuw.pdf
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/6782679624.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=palm+fringed+beach+meaning
    • 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_off00013348.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 16792 bytes
font_01_sfnt_off00014b55.bin
1f587bffb409cb7aa2fe1f13f8e5d8f6f39434220749f6ea777eb57bfa8486c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B55 9528 bytes
font_02_sfnt_off000169fa.bin
103d391db9ebd64b89ae9f8022ba37da8c72ac7b993ea595bbb056eb40db1125
pdf-font-stream PDF embedded font (sfnt) at offset 0x169FA 18348 bytes
font_03_sfnt_off00019a6e.bin
c072d488aff549e995fa383cc0032f4da92d7b907c0359472dc0519d28dd0b46
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A6E 10680 bytes