Malicious PDF — malware analysis report

Static analysis result for SHA-256 87eff828b12aadbb…

MALICIOUS

PDF

83.3 KB Created: 2021-08-18 11:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7779bbd233e944ca11b445f446db687e SHA-1: 4182a41d61e4fa90089ccf91216cefdce64a1995 SHA-256: 87eff828b12aadbbf35829d61ae110c3ce4e4d51e4c287334c2a1cdb5e6d2392
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The document body was unreadable, but the presence of many external URIs strongly indicates a malicious intent to redirect users to harmful sites.

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://catamma.ru/uplcv?utm_term=how+do+you+reset+the+radio+on+a+2014+jeep+grand+cherokee PDF link annotation
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/sosomewone.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b097935fc---93631273286.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/v5ig8dmn2mgbnn294sebb918o7/buzikedipusipiro.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c899ce5c1af---87050423595.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63b2d63e5c---84874896493.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8611fc5c0c---pofovofelinixe.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/datel.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ca01615b---jowugovono.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/sonobiliwugusij.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160adc88421aec---medipevupejexefujigoj.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/jewilojowib.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/wivegelu.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/63869565773.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a7e96ad0---42787193255.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160931e04b9285---wibumuzanajepirux.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/63193607827.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6shofh2oqjqfmlr3r5oi61c0hb/balugatexu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611af2015f807---rexarokoseduguminowadoxij.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/jetevusuwemasapepinaxapom.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/nonataxetat.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f434965945---36552880866.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/48859766962.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0pc0seovkn5g9a11ivl9ppoghk/38617430429.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_off0000de19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 17104 bytes
SHA-256: f2fd0586c59aac2bc4b15be1e615f6ea004d2cca1d2b84efadcb0b0f6e20dda3
font_02_sfnt_off000122f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F1 11632 bytes
SHA-256: fd064f8d006ccb7f6fc950bb9201a23a1fb6d6f423754df4a8d0f749a8ff15ec

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