Malicious PDF — malware analysis report

Static analysis result for SHA-256 af6e0687b64d5d34…

MALICIOUS

PDF

93.9 KB Created: 2021-09-06 23:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9df7ec5d9844f6a714f197a25b9c820 SHA-1: e599f0dd0db5a99bb585af0c62ef16a66e50398f SHA-256: af6e0687b64d5d34194aa7563d43d0235b36f2d6e09a421494c4a7f3fea1f714
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://interstroy96.ru/uploads/files/segif.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4296e43c---xotireza.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ov7uq6r6ml273jg01014etvfq4/8552299873.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf82331a3e6---93237754992.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854543f4057---danegufuxiwaxutuwog.pdfIn PDF document text
    • http://www.celso.org/download/buwinuxatu.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b09f5e8a6a990dee4cc62703ad8d0427/zepatanubidofikosobetinaf.pdfIn PDF document text
    • http://coinmarketsuite.com/ckfinder/userfiles/files/pitiwugapoxup.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/99897450334.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c6722ccad9dceb6d67b382281b65175c/86696550627.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/45403538195.pdfIn PDF document text
    • https://chp-travel.ir/data/file/ranotesawofiseje.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704290c1190---rolojozolemadazuvux.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/jezusajozas.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/xomelebufevepasanexulufad.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/95765539063.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/9873fc621456c43a0f8f07ccb29ae24b/xukoxemamunojemixemari.pdfIn PDF document text
    • http://soc-in.com/data/media/files/sipojaki.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/befesilarim.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d270bcb0---94820515041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=vade+mecum+2018+pdf+baixar+gratisPDF 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_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 21492 bytes
SHA-256: 61acd79a3cd90354312fe24b6538dc5d54dd6efcdcfface45a07a6e9c2e1e363
font_01_sfnt_off000135c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD8 11508 bytes
SHA-256: e111c027ea8913003c9f006934f082ec1b230ea93f4211e344c1f34749f76e5b