Malicious PDF — malware analysis report

Static analysis result for SHA-256 660b07d07f41b4e9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 14:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d8799fea1fe76f1e1e44a4795b50e6ac SHA-1: 9af00a29081872f27c799febaf6963f51a5d7a74 SHA-256: 660b07d07f41b4e9bed383b91a12023f389962ad4ad2f24d9e94b2bc9e1779cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=fabrizio+corona+libro+pdf PDF link annotation
    • https://wfca-czech.cz/temp/userfiles/files/vepejuvevaludewobebufode.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f7bccfb46e93ea8bd5da7227247731c2/28731434135.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/43186399764.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/862gacntqqne6vhcq8s82cqstn/15901008592.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/tuwuweduwavuf.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e2311ab08---80800585344.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/kerififutuzubodawaf.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099fe3f41fd4---99444461731.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/noran.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/56584431927.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/penepogevexufoxekitusuzi.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/puromumiboli.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c368ec838---25034024767.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/56951968671.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/bumig.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/976c6632526dbd8cf1f936e7fabe7990/13071775589.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/58637022506.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/sozij.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/xemukadoxalubilokoxap.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/69173939627.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kh8ip4ro47m1eil5hbbkd5bgu1/fatuban.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e480ac3b7---16546749904.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/92721701758.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/o0es9dflio51p9qoom4uja65v0/xawavosopoxowomoma.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/4605226865.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82000a656f7424e6f0636327ae42d820/98002261449.pdfIn PDF document text
    • http://allasclub.com/campannas/file/30013090597.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9mmk4ur33eibjjprtbcgop9362/norifenitujere.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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 10392 bytes
SHA-256: 9c0ec4a53c7ce8c64c2cdcca2757ef49a0f2629582cf4bfb4495cfc6af11c36b
font_01_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 18348 bytes
SHA-256: 786889d50a9ab3cd8b44a694598a450192b136c198fee977e38cc3afb7b8e3b5

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