Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf6e4b73751175a…

MALICIOUS

PDF

69.8 KB Created: 2021-09-18 02:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 463e3673ff841eeae98019ece30cbcda SHA-1: 648320312d33da285a3b47240f2fee8742628257 SHA-256: fcf6e4b73751175a328be00b3e12f7544df7f94b605548b91435a9577e5326bf
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating phishing or trojan activity. It functions as a link farm, with numerous URLs pointing to various domains, including compromised WordPress sites. The presence of 'utm_term' in one URL suggests a potential phishing lure to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://allytemp.ru/uplcv?utm_term=cod+black+ops+download+for+pc+free PDF link annotation
    • http://mkpstroitel.ru/upload/files/larijos.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/17781613530.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145163c60073---zilekesomigamejuke.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/fivepapulegegevuli.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210912181307.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0b0c6e1d23c13f34d2c1ec4f44650b63/4035220507.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/30893549424.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/lopodisigofo.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/26066805370.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/nakikisepekijotevuwug.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/87255901784.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/38029944428.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f1a55adad---1154130798.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f4dcd6d7---podepatuvidowagosumizeda.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/sodawarojata.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6c10954c---vuvuk.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/depulaw.pdfIn PDF document text
    • http://guchen.ru/d/files/pidabosavulesepusize.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/likezikix.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/tikebuvudumofoveziwiz.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a65a16c176---4437657927.pdfIn PDF document text
    • 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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 10772 bytes
SHA-256: d855b427359da889a4f244f90c9547a40248414901e525b153d8ecd031ecf26d
font_01_sfnt_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 14912 bytes
SHA-256: 2f32e62e12857913bf188457bfd4aba4880333dcc88d138e09419187d853a8d2
font_02_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1