Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae27c6b9c358725…

MALICIOUS

PDF

77.2 KB Created: 2021-07-05 06:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1546574f664d709703ada110610b3f91 SHA-1: 0ff3112365cd157d53b4cdf984cd217db2daa644 SHA-256: cae27c6b9c358725b6caf7c3c273d10c5f98329c3d6e3665b647f280b81bfd6b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The PDF structure and link farm behavior are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/qua3nfljje695v8h0v4tl90aa1/zebejasi.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/72b9c364da4f71251e4828f47af0d95d/xozaleju.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/81788dc0a2549010d5d4d58c31c74a6c/82580483387.pdfIn PDF document text
    • http://afro-safari.com/upload/files/40320216286.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/sawifinenuwiwovoxelu.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7kvvrggg8eu2bjr89hffg743ta/duwojatev.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f4e95791b---541538503.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/3105920863.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/wujarezajijaxif.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/renokep.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/69398440678.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/92377101764.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/10987478371.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/64318840200.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afe2744c1---libuxidololonetip.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/f37d99d0502bb3f54bcbc98a8eb27eb4/30835751135.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/epc1fdk0ag6rpm360jddej28bl/49939132696.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/valodanop.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/domopasevovakobakojem.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc701c4baf---18752600334.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/86061955927.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd581d21e3---vijubupawu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16097d4bdcc3f0---josewob.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/ruxixujizukijuro.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/017bc06rputekibhtmkei8jo0v/woxizo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+say+ghost+in+spanishPDF 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_off0000cace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACE 18044 bytes
SHA-256: db92e5971ee25f3988c7b2dc7b21761deae34009fd1b3940face75975ecc9e3c
font_01_sfnt_off0000f889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 10444 bytes
SHA-256: 669d6259ab3510f8c2d81ecd03e5fb4ed63947429a3b21e6e6b4ca02440d5e01