Malicious PDF — malware analysis report

Static analysis result for SHA-256 e280dca2f122df78…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 00:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6e6143eeebe7f2b6d9b0ebe4e07257c7 SHA-1: df4d99d6ddc34da0abf0f97620f01018c4345a38 SHA-256: e280dca2f122df7824cdaf954b891ea419636a4f26177bfb79c46e373d956a62
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 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae0a5d0ab---64926477754.pdf In PDF document text
    • http://gzmzwl.com/Uploadfiles/files/53150334807.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/507bccf070bda6a99ec16e059d66a7c4/regazedovaj.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/wasetuvorugadaja.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/sevizinekekexisuxelefat.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/ef7eeaf25e94682cfff1f285c076f94d/vatafonuworunime.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c7dd79644---divapesetorotusazinu.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/63257058829.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d25de4830190f9d4d2f7096aef0e1201/sopoxobejurexadi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/wibazomefaf.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/pumowezagagevepupafo.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/49774672312.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/tofumonejigusanosu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1713e76b0---39203218901.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dfa5f0818---68767854109.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/suxolunodedugileb.pdfIn PDF document text
    • http://greenld.com/userfiles/36805603780.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/81361777198.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864652c140d---dakefedeba.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/88068591105.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/64058823454.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8c57434c3a96da613c98d06696c6bc3e/75450874532.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/53619658015.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/gizegumuzepizaniwunafafe.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/nageboxixoraxarukurawobup.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/jokuramefos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=lords+of+salem+book+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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 10552 bytes
SHA-256: 79109026c41f8089031373344e170e813db17e9ce3dacb8f5fc38a3d207d875e
font_01_sfnt_off0000fd98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD98 17208 bytes
SHA-256: 6854dfa6ad1d5d1988624ca4699a6dbe4fdbc09e84f20c5a17d52eb3545772e3
font_02_sfnt_off00012a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1