Malicious PDF — malware analysis report

Static analysis result for SHA-256 14543a951d1a12da…

MALICIOUS

PDF

92.8 KB Created: 2021-07-26 14:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d87c897f94563f886a8ea6923cd266fb SHA-1: 87cc4aa8ce976dd1082a420287dbc685be6ad065 SHA-256: 14543a951d1a12da8467590f2d35bb4a4a87ab2d41f4a3af1101f554099364a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF link farm heuristics further supports this, indicating an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076738eebd85---10941772088.pdf In PDF document text
    • http://cascinamana.it/userfiles/file/bazifiramiga.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/94578d82947d992a49e1f9d7e6edd36d/31992323483.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3ee040a16a73abc02277835d41ea6b54/76249094911.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c49159990---pixemiwaseruxojupat.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/weborakanazimipadawukav.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/4874238220.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2a1915f5072029665660ae2ce6c6d992/37952704012.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2740216d8---dizus.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/rorowas.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609036e7032e4---nosiragusewanifopuj.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b847dfcbb8a---19903088477.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210726155020_791345791.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d36f782bd6---64399219235.pdfIn PDF document text
    • https://alutat.com/data/file/18072382706.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/98e282a118f51906adcf9ee63cb7d513/9212427947.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160948449d3b62---20309509082.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/suzovikazififebosinu.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ec7ea18668b45cde42fdd8a4ab1dedd3/15907335849.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/89509b23474e5c2232a772b7b54c54e6/girekekavajukigozuz.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1b32d20ed---26266229905.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/43flerplqd47ine0dmoucjqtu7/1029078721.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/didulufodiwiped.pdfIn PDF document text
    • http://rld-carbon.ru/file/gizosafanubezem.pdfIn PDF document text
    • http://gardatrans.com/content/Files/tipirajosaradexitemuxidud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rite+aid+covid+testing+poughkeepsiePDF 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_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 16976 bytes
SHA-256: 6993fec5f1a88c6b5da1ec277574058dff5c3d160e09dc2cd6ad13ce077daba0
font_01_sfnt_off000132cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132CD 10952 bytes
SHA-256: e4ca0b6189b7972471bd3e44587e2b6174b3dbc8b6b33940539f2f5d48997a08
font_02_sfnt_off00014bfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1