Malicious PDF — malware analysis report

Static analysis result for SHA-256 98771a7f6cc6c136…

MALICIOUS

PDF

87.0 KB Created: 2021-08-13 01:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de1ca03848fb90c38e150925a2cf246e SHA-1: 69690c3bebda695e2846217c3e80206d94a1bbf7 SHA-256: 98771a7f6cc6c136d8ee4e9ac89b67068d224dc926eff6df41751c26dade51ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads, a common technique for distributing malware or phishing content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ecc13klot3cst909blo3d0pfgc/42823954922.pdf In PDF document text
    • http://cbcom.eu/ressource/site-image/files/motasetekeberusarev.pdfIn PDF document text
    • https://jobtiara.com/files/files/17339207489.pdfIn PDF document text
    • https://kueapem.com/contents//files/tufegobitop.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jives.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6357aa0ce---4094233063.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/likokaxijalo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607331b07a7d8---sawulatiwitadij.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/35784090216.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2737dcc2c32a88fecd34c61ce5c53ae3/pamefuvoba.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f997819b074---fitetemivagebikutinapad.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc5b4050a1---64283579661.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe3985ef7---lobupoxogopov.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/4mkuf7d43ft3ikduf742hj210q/mozupuluwizagezilapor.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7gf46up6aa2lrkci5q6urtetvm/73284468169.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079904275073---25523839155.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/waxukef.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/2009519782.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/4t8r4o3o4ogr245rp8669cq582/vazag.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/26950336442.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff1d3345e---gusepali.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/tokuvub.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/sudixotobubosonanen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=reglage+pression+chaudiere+viessmann+vitopend+100PDF 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_off0000ebe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE7 11348 bytes
SHA-256: fa54b648338e5a5bb7f60790f3ec0b42fcf45ead7600d39c9907d1dad169ae18
font_01_sfnt_off0001063e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063E 18076 bytes
SHA-256: e6ea5a3026684f9449f19b020c93aa309b327d7627afe8fc7c1f2921125a9021
font_02_sfnt_off0001339e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1