Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9fbd42bed1f5dd…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 15:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3a1958bf243085d5e8abdb3084b26ead SHA-1: b51489509c0ac751499c5c88029d4ac01e67e12a SHA-256: 6a9fbd42bed1f5dd3235b22b792f7a6b9aa00e4e327b3fef369d112eba81e4bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, specifically within form upload directories. These links are designed to host further malicious PDFs, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608260463e81d---6463124435.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/7fu3rslmh7r6rhtpf2vo735oaf/49370625930.pdfIn PDF document text
    • http://wirheiraten.de/images/file/xubamoluvok.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/desuran.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/dfd75820cc4a5af26a1c8f7f35d8a8d7/narebul.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/91320793182.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wosinowiletivaketajeri.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/potato.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/76734126069.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c38e5e419b---fujuwosomelebogefemub.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/4k5cdkmc8pds8fagcv47i5agpc/92626821411.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609704ce6a83a---taxop.pdfIn PDF document text
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/44155987256.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a23839104---fobewetozokowisisomipire.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/14805951988.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/54733179405.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/eiqh2psdfasocbr376g2v2q1t3/73213255311.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/009baa0c47abde984ee9be2ce026e208/80791384766.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/16005385416.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6cd49eacdc405e8d543b6690040e9a2f/dapodifajuta.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1i7kselv6pqdrov38u7pkaau10/jaruwapixet.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/38d94328c3cc97baaf8dad62b99a5f20/sijure.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/80686052736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dietary+oxalate+sourcesPDF 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_off0000eb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7B 17160 bytes
SHA-256: 498a7264c109a01998981772cd85e9793324a08368e225e75ff179a7300270ef
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 10436 bytes
SHA-256: 4bdc50a7680e3079a7598a7cc1316f9a712f716931f6a55c2d8761d55eb429ba

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