Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5e8813cccb8f22…

MALICIOUS

PDF

89.4 KB Created: 2021-09-01 00:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0c67d5c8ccca0a7f6c221494ed2660f SHA-1: e8807485e868af56d2503b42465a5d180ff2abf2 SHA-256: 4e5e8813cccb8f22fe0230ce128bcb3d284ee23223757b7f15b8346ac104b961
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://irlanc.ru/uplcv?utm_term=hypoxic+encephalopathy+meaning PDF link annotation
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/96669805182.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/zoketudejokim.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210615200311_20945d.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c299a8be---76826114598.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/84546573306.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/35281239640.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/milifosobi.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/wenot.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/8sv1hq548ssvuboisf71rvqtk2/30830903722.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/xufowovusenekebi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99c52ab6f---43418583425.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f7639100c911134683bdf81a655af760/62672942914.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/fubenukowotopemarugopo.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/72019044102.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8c80305d8---69461439976.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/kuzugubekilalakoponenepe.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b3979f5e9cdbe8ddc3f3a7f1b1de8a01/darevuzitotigovaranepefot.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749298e4839---24643910328.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc970f69e---bepig.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/7ccjtpdt5ebo30vu824hlr6g1s/pikerovirotano.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b3067cd86---vuvaf.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xizakovuvinidawokewata.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/98394034727.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a244ca5e5ce---12446938458.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_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 18400 bytes
SHA-256: 4a689fb4eb91965ee370462488c81ad9cbe603f502f1ecd7feff43a72b2d68a0
font_02_sfnt_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 10760 bytes
SHA-256: 4a4f157e2676edfd1a80ca49395020631fb20f3b4867a8fdd2b3e3cd51d947b7

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