Malicious PDF — malware analysis report

Static analysis result for SHA-256 65de55e115f00751…

MALICIOUS

PDF

86.9 KB Created: 2021-08-23 09:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 640cb21ca25ba1ba6a63f107859f8494 SHA-1: b5c32d84d6e1cea7d119d14d266920c29725f336 SHA-256: 65de55e115f00751806aaf0e27d490da1b2e6717b477c92899b5e33abe7aec3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and a heuristic firing for a 'download button' lure, suggesting a phishing or social engineering attack. The document body is heavily obfuscated and unreadable, but the presence of external links and the overall detection profile point towards a malicious PDF designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mariangelesorrico.com/galeria/files/zaporinonodina.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4228c6a458---5591592003.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/mivemuw.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/42517384127.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083340d87de0---12837427637.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/89311360751.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/tjm69lrkiu3nkrn2jmkht0uo4g/zeliv.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/vm1due8qu26ar7s8i7jmgmtita/13343391990.pdfIn PDF document text
    • http://d4sontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jizimakanakejepevetu.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/tutuzoxasixubabinu.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qkn17ds40160r526l473lf7a9/fodemixim.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xuwudumagabevorokuged.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/729ad04098abd231189059f18203781c/jotujojof.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/790431752.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210702132837.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/45e6696978a0b459e217ab7ef3075053/83010112253.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/h8vcm1lv93dl9eld26elgj1q25/70805744030.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/98483339713.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/57998159464.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8b72844d---mawimu.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a444b711db9---wurubunibetolotajawup.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/57487690963.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/sivizajaxugesivadaxokuz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s2qmvnosirbh1r046neth72ou6/dotipemojurunikatakasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=train+to+busan+2+full+movie+downloadPDF 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_off0000f02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02E 16532 bytes
SHA-256: 4c43353cd172453f5f25a9673698f08de00dc04a2ce2934d4c6792512a73b4ef
font_01_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13350 10992 bytes
SHA-256: e901d3ee5c9a94163ca045fe411fef0c6b7afcbf3942fc0d068ff3af56d0711f

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