Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e32b6fac2a9649…

MALICIOUS

PDF

97.7 KB Created: 2021-09-06 08:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 579ac56c244085707044349ac2c89954 SHA-1: 157002ffda0d14a167d285aa91af546ab4361eff SHA-256: 73e32b6fac2a9649e062024bab83bad87fcc0a381f0d15573317adbac4355ed7
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farm patterns pointing to compromised WordPress upload directories and other potentially malicious hosts. These links are designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a060854f39---rujifovu.pdf In PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de7320b76ed---26984313406.pdfIn PDF document text
    • http://thegioioto.store/upload/files/85006263731.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080600828224---37932939237.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/nadefuvudizediwutubafipat.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fbac6d6e00ebaaac46564d37f906776a/buwuxezojifir.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d625ddc0b8ce863c3ee20a6c62a1f60b/266250626.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/163a824f00d720a1c6919df592f6511c/taretaruludip.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/lpos5muvvfkejh30le1p81ehm7/80280044173.pdfIn PDF document text
    • https://subarini.ro/mm/file/zifosanow.pdfIn PDF document text
    • http://siembra.me/uploads/files/48327479638.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/jinuxababudiribi.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/lukuv.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b352849c66b---49638745547.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/58255282210.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/43071563246.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716390e3f71---bokuzogirerusi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/73947044971.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/23507454448.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b438992077---42206872225.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f54d3d4ca---58985104903.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adff54e20fa---30383382811.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/roxuzusapigikejal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=software+engineering+2+marks+questions+pdfPDF 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_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 18880 bytes
SHA-256: 696dd40dc09cbad2bd3d89b341234525831d7abc115ae4f78a2071aebdd23e64
font_01_sfnt_off00014609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14609 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E20 11412 bytes
SHA-256: 5a23aeff6aa16376ebdc1c52a71fc7de5ce6adc2a00dbff02f9a5ebc79268d67