Malicious PDF — malware analysis report

Static analysis result for SHA-256 3613c60d0756a1db…

MALICIOUS

PDF

102.0 KB Created: 2021-08-25 07:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d05411df4fee9a36c540f3c11203bedb SHA-1: 1a0bc8a2caccb00cfc2c865f2ba47d230cf9e8ed SHA-256: 3613c60d0756a1db9ae26d72c16584c9411f6901b97cd3209d0c6cfafbaafb1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, which in turn host PDF files. These PDFs likely serve as lures for phishing or to deliver further malicious content. The presence of multiple distinct hosts and the use of disposable hosting indicate a deliberate effort to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80f0e69c7---48545470658.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3054dc5c3---nukaluxede.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/8a615095b860a13a0a2b6c9439e2a8ef/4821697653.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbcea28a0---46383243978.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160befc7a0ac64---rexuju.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/pofarukeviteririno.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gnqt67sstomb4j10ki74hhq4qr/50551601971.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210523120016.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/peresepup.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c45583d26db---xakiju.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/722ef7900ae8ceef8abb43b0949ec4c5/xulilavezi.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114edc0d365a---gasoligo.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/jabumijowubapa.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fe8ddd268---52334595650.pdfIn PDF document text
    • http://rinsacars.com/files/others/vejif.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/ba4228793a21fec96b66d77137a5c2d0/62157267698.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/16158524778.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/88682847108.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/55730457683.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55368e09f6---tevogafirarirobum.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/85400049898.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85075bc273---gizeteboge.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0283cb7f843e0b75dc54c950f2750b98/zejavafokezaf.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/gipimiwumatovitivok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=back+ache+and+difficulty+breathingPDF 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_off00012761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12761 17848 bytes
SHA-256: a882b5903b642cb6b97568c9205330673fd7ef3cfda00072418740cf51d84804
font_01_sfnt_off00015615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016e2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E2C 10964 bytes
SHA-256: 04a323c28695abf887bbb0f5dcaf2f19dfa28cb10c03e9626ea6abd098850621

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