Malicious PDF — malware analysis report

Static analysis result for SHA-256 da42ce404e4987f2…

MALICIOUS

PDF

87.4 KB Created: 2021-07-09 19:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b633769e6ac99ca8c80e0fa4838988d SHA-1: 3fe824328a0beed165484983ecbd27868a597d07 SHA-256: da42ce404e4987f2be7a820a7e7dc132a71d7f490730ed26682747ebfe71dd47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farm indicators suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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://garglob.ru/uplcv?utm_term=the+next+blood+moon
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbcad153b50---jenilifilonasusadodudila.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074360e0e4c0---xamoro.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0914ed9b76affd5587992d9055a008b7/80095063176.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160966e52960c2---6221753161.pdf
    • http://igigeothermal.jp/userfiles/file/tevujejuzid.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad05ed745bf---91648600997.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb034d27d91---41329512073.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9310ae70---rirubugaseri.pdf
    • http://namngonviet.vn/user-/files/3238829341.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/eadd62143e3f68bbcc7ce5c3ce27b984/12041753136.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b09c990b1---59289890574.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/4481ba62e92a8ec4d3316206f2ed4f17/35560921107.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff80ddb2bb---vogijunasuzifowisalobux.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbc18eacb---16142010623.pdf
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/40082504384.pdf
    • http://thietbixanh.net/uploads/files/58083658436.pdf
    • https://emauto.lv/index/images/up/file/23416784517.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tvao0ignbnvoa5vki2m81ffq99/tufezemuvujusetanoxis.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/02e50545472d68e0d4778043939e1240/vikefisovis.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-30/20210630072824471431.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b58017a6d2---kotolulome.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e453d45133---32607587953.pdf
    • http://wsm.hk/images/uploadfiles/file/41482113115.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_off0000f641.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF641 16792 bytes
font_01_sfnt_off00010e58.bin
9c7c26004b8d9da61bace1c5f1b2c7d88196e5381250768c3c8b2f3f76bcc5ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E58 10196 bytes
font_02_sfnt_off000124f1.bin
af51e9734bd04b532f6dcf4070eabbae3da4c1bc2f1df4778c4df955a1865137
pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 16916 bytes