Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a4902e6557f9f8…

MALICIOUS

PDF

94.6 KB Created: 2021-08-13 23:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 694918f904eb34947cedc8567f08f5ce SHA-1: 118ede5ed461ff48c9108900fc2d61bbb31a2257 SHA-256: 76a4902e6557f9f8f3151ccf265b8d69408a00c363d13b367470584e20b55023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several embedded URLs point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093a65d085ce---66966330981.pdf In PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/ralitedonovakolipiz.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/siladoruvenasajeniku.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/11788601585.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/21178300896.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/86114845194.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d141e723b3586323d20200218efbc722/ruluvidomivebezowojef.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/notapamumekiv.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/5cfbd65a71278d885179a1f837b9fc98/94908047174.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db9fb4c087e---ronufosenekitumop.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b773bd94be3---6369971436.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/eb47968e1fe7320d089141084a637349/lizifexalamujuserod.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/gelelogidetu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/0d94a6226a0d6032deda5222fc5929e2/7137355804.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/959e97c7e4e755eb4d54d9421ccc1332/xogirovodipufi.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/volavag.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/8095135813.pdfIn PDF document text
    • https://alohasafaris.com/files/17594712983.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255283ad52---pawamuxanu.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/suduso.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/a0g8tao1opubhk66p26eb0nn15/fajaguzinipovod.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/zemabaviwizadubatuviko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cursive+handwriting+practice+for+adults+freePDF 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_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12372 17188 bytes
SHA-256: 7a2b1b9b5d1ef079d971b9b85a49849bd1310738db186c5fe515d0d824550930
font_02_sfnt_off0001505d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505D 11180 bytes
SHA-256: 23dcaa83f66b58ac3b00171cb11576f078c8401ec7369f24855c5992b2bca937

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