Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc946fa6104ef302…

MALICIOUS

PDF

82.0 KB Created: 2021-10-09 03:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea5f746582e26c8a5ba1d902385fcea9 SHA-1: 032120bb8aaaadde3680ccb4f08329ab108bd91c SHA-256: dc946fa6104ef302eae17253e1a528c605d888ea04463627cadc0353d0ae4978
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=slow+cooker+tri+tip+roast+with+vegetables
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161609b1a727c0---lenopu.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479f73509d1---67716477453.pdf
    • http://scro.ru/pic/file/posokitulidutesujo.pdf
    • http://drtamerturan.com/file/29782667115.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sngcrpf9opj62lt3n5u2kmt48c/80690162544.pdf
    • https://makenie.com/upload/files/86703397731.pdf
    • http://hz-karavany.cz/ckfinder/userfiles/files/vejero.pdf
    • https://hankilfood.com/upfile/files/jewosufadilizere.pdf
    • https://ykitraders.com/UserFiles/file/92457922864.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/38336874153.pdf
    • http://formpart.com/upload/ckfinder/files/43086988671.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/fefivokokowogok.pdf
    • http://martom24.pl/martom/userfiles/file/74242443161.pdf
    • http://crescentcarpets.com/userfiles/file/zuxapemosexebefixex.pdf
    • https://atlastoursntravels.com/userfiles/file/48363486356.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lafelivuru.pdf
    • http://caogenzhiben.com/filespath/files/20210922165654.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2cff1982b95b51740129b0752f75ee8d/polalogazelog.pdf
    • http://brickform.cz/obrazky/files/42049131589.pdf
    • http://mizuho-co.net/file/ck/files/37115380994.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/43240549333.pdf
    • https://tessuno.com/upload/files/613ffb23173e3.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d442.bin
fe5294cb6bf34feb5c23b88b54475a55a209d89a03bbe627f7bb2842a9d8206d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD442 19984 bytes
font_01_sfnt_off00010885.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 16792 bytes
font_02_sfnt_off0001209c.bin
51583177ec80a4878a544edf56cf6b16cc2817c84a4b8736387753a191f620b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 11008 bytes

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