Malicious PDF — malware analysis report

Static analysis result for SHA-256 518afa49775a1ddd…

MALICIOUS

PDF

97.8 KB Created: 2021-08-12 23:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 3250cbeaba0d712672a21d0ecd5512fa SHA-1: adcbd21a9c6625389c52ded6f8e03ec740400bcf SHA-256: 518afa49775a1ddd3c1d7cf9cf7b95d0551d0d496a3f14a5dd608e68c86080a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to external websites, many of which are hosted on domains identified as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a11804530fd---jabaradawe.pdf In PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-7-31/20210731120745230508.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d20feec6b72---sunakesafupalugipobimu.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/58993577594.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/bumovubazisozuse.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/49912799424.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/ruligor.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/rifinav.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/82494192470.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275f9aacac---5640036029.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100112b1ae6d---48311582609.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa0ed62aaf---42923675224.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/42737448c13bdba5d6aeb5acc7d068db/xogakidugumigoduzinuz.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/hnc47naqd9s5rv5vm1v702e3ou/8630606449.pdfIn PDF document text
    • https://morabia.fi/images/file/sepajad.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/rajusu.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/vapizaganaz.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/sogokabav.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/mezofixek.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/82790185329.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/72632975436.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/bh8u29tc75f4pdn39ie5361k9v/71111795623.pdfIn PDF document text
    • https://qkon.ca/images/file/83106925135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=examen+primer+grado+segundo+bimestre+lainitasPDF 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_off0001159c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159C 11060 bytes
SHA-256: 62349bfd6bebd1091bcb902fd161e717752f9aa5720d9745a6dbb9dc1f0ef68d
font_01_sfnt_off00012ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDE 19548 bytes
SHA-256: 957675ba1ac516795737c28d3b5fb304f4c5dc03dc39e29b5d2aa61b4c604f1d
font_02_sfnt_off000160bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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