Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3dacf057e3a94b4…

MALICIOUS

PDF

75.2 KB Created: 2021-09-02 12:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1f5db020a4accd3d92c610d3096e214 SHA-1: d7c5f0ed50ffadbe304070600d04510a680eee5c SHA-256: b3dacf057e3a94b467552bef0183e7d612e4ea38495d80ceeecbe4242841efed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://toromecanicorodeo.com/files/63472400475.pdf In PDF document text
    • https://questyme.com/userfiles/file/vidumevosajore.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/gixuraganamipo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa05755fd---rutukiwib.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/07/files/210727092807.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/kegefoputud.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/sikewakarozudizejugonizof.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/16271525581.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62fe466f15---61359116920.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/libawitaded.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/bojopikosib.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/lokesozixabipaperevur.pdfIn PDF document text
    • http://fitviewer.biz/files/file/17497837595.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/bizawiwigamujivupivewo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/80165039074.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b86bdc7fc---vufixivoxizurol.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c3f60ad47---89107895972.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/i2ecvqfb0ou1afej6tadtsosn3/66474304576.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/beragiminakowuf.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/nl9rqetf3e00iijg8vdddkmh1r/39734025916.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d868eadb98f---nokokegivogetajizoradepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=retailing+management+10th+edition+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_off0000c1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FD 10896 bytes
SHA-256: 91d09946f2d7fab0cff5495eada2d297e71ab39913da901d7a8b2826b196b12b
font_01_sfnt_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 17180 bytes
SHA-256: afb38a20cb1724ce4114a4f8c834e23d3120479f1c26844045e86fcb5ec067e9
font_02_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1