Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b27ba5f9ec2c28…

MALICIOUS

PDF

72.7 KB Created: 2021-09-06 05:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c097f7013f897f75c0355a6007c348aa SHA-1: 9e75e8bb1601a6bcc75ec2b9112ffdc1d10e744b SHA-256: 48b27ba5f9ec2c28e7ec6936dd2bb0d45e782d2b792e7b733e08f29c4e511c89
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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 https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/7f828a126755e5553e9d9325ba776beb/63138711197.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ffaa5bdb2---21210245388.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5a739dc4a---12782093987.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16113a3cd4a47e---49837868805.pdf
    • http://kirilmazbardak.com/userfiles/file/73417300963.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c3184bcf58f---muvela.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe9393be0---wodudel.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160846c1ba3535---22172042336.pdf
    • http://rowanfamilyreunion.com/clients/28915/File/98345711648.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5b0868d5---zazowafofagisato.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8ce28c341---27757447233.pdf
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1627653260_211c31bf9a.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/2be677c0740ddcd935dfe1e3c6ed5634/tusozovagonepumugax.pdf
    • http://nirmalapublicschoolerumely.com/userfiles/file/fufifufilenokaf.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a97f2be4436---vesibaru.pdf
    • http://np-laser.com/upload_fck/file/2021-7-10/20210710170041804874.pdf
    • https://callmarkinvestments.com/callmark/files/58371050375.pdf
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/dibivagan.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f8ba0e19b5205c535edde2ebd2134e2e/jixaboveb.pdf
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/rurudilegoli.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l1vps8klmhrfnjl73nbq783oa5/41999040350.pdf
    • http://123podkrovie.sk/editor_uploads/files/81760066835.pdf
    • http://hyeminshop.com/DATA/files/gofuxudijidore.pdf
    • https://pacantioquia.org/aym_image/files/50588355582.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=timeline+worksheet+grade+5
    • 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_off0000bb6f.bin
6e099ec6c50538a88e32fdb54f2fc3c81486ba50fcdb7c23c8ffc14c69ee8489
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB6F 15836 bytes
font_01_sfnt_off0000e3f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 16792 bytes
font_02_sfnt_off0000fc0a.bin
6b6ca8ecf44358097485a43279c7c5d885540c40ec51166f1958d28a30192154
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0A 10968 bytes