Malicious PDF — malware analysis report

Static analysis result for SHA-256 e739f2280acb58e5…

MALICIOUS

PDF

94.4 KB Created: 2021-07-25 03:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5ac4e9724120a3fcbbf6e51d0a1a330 SHA-1: d33c1a4949d138c9ab165856ba50954f98927de9 SHA-256: e739f2280acb58e51ce613ad92f38d35da032c9343df0d0b962410c4663778c1
156 Risk Score

Malware Insights

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

The PDF 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 it's designed to redirect users to potentially harmful sites. The embedded URLs, while some are confirmed benign, are part of a larger pattern of suspicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a68ag58p4e83kapgvdn3lk6nn/gariziruvufim.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/8701110429.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff3172ff0---85465704401.pdf
    • https://contabil-fiscal.ro/mm/file/wuzawinerizevanumogi.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce89f81c12---wisimepedilujogovafug.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160769796529dd---58966402121.pdf
    • http://angarakshaksecurity.com/userfiles/file/madikibi.pdf
    • http://k-souz.com/userfiles/file/91800563358.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/13a8de6ce46163460f079a9309f9b9ce/84515763368.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/semipegom.pdf
    • http://thunderstar.cn/userfiles/file/20210503074924710310821.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/57010584849.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/118ad326d986ea441a1756ffc7bb7ac7/71103431281.pdf
    • http://upservice.expert/admin/ckfinder/userfiles/files/27157995468.pdf
    • http://bjhtdszdh.com/v15/Upload/file/2021672102847.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160857c2dafaf3---46352073821.pdf
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/lezebisumulivaj.pdf
    • http://granite1962.com/clients/869125/File/dunemox.pdf
    • https://equipelec.fr/ckfinder/userfiles/files/48574932511.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1d98e6c1d---votizarurifawebemuwus.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071a86b1d0fd---moponuzen.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1dcd6b265---lukusadisamib.pdf
    • http://derkwoo.com/upload/editor/files/visikovugo.pdf
    • http://ekonopuntos.com/campannas/file/87756357007.pdf
    • http://mirutte.com/newsfiles/files/wojisapusinezevuribini.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad2c5a0084---3108174241.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=celular+bom+e+barato+2020+ate+800+reais
    • 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_off0000ff53.bin
c8f2c0ccbc9510e0ad7bbbb09006e77cb542ded1d527fe3998da2608fdbcc13f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 2184 bytes
font_01_sfnt_off000108f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16792 bytes
font_02_sfnt_off00012109.bin
716344261796180a75db3c2e6a06d02890003a9c32179ece42c43a3b76c3c98c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 10884 bytes
font_03_sfnt_off00013a4c.bin
9d2d39809cea95dc8bfd4d3f1ace9180f681666ec719d7e049054dafa9ed727e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 19112 bytes