Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67bcf941eedc6ae…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 20:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8566f4ee1bd62d57ccff46ac11291de5 SHA-1: 297c7e9bdf5d567b768e2cff4ce19098eeb5a002 SHA-256: b67bcf941eedc6aefdabbfeb2b7463a2b6c33a191368f097fb508fed9adcf5d4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites for phishing or malware delivery. The document body is unreadable due to encoding issues, but the heuristics strongly suggest a phishing or malware distribution campaign.

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://coretry.ru/uplcv?utm_term=how+much+does+it+cost+to+change+a+manual+to+an+automatic PDF link annotation
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b7061f382---xesagikemegoxoz.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/fenavawiwi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceb525006b---pesobata.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/tagasubekuse.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce9044b6ca---levijavuranuzotokoxi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1b1b70475---55096675611.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/fb3f83d039470a99c36b418705a811f0/robelo.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/mizozawibupe.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/piwejibubalusonurevugas.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/besujimeruxigomaboda.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/35402824483.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974fb5a2440---pevaxewibolekabo.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/3de709b36693be665d5d4107dd56718c/4010971999.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/75636247694.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdda187feb---munova.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092996538eb6---57068304979.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/utgu3u0v4oo6jk51agm27n12g0/lasunojukifowewutukedov.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e1d18ec567fc6154e45385d4c6b80e41/masekisakonit.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/figasebabiziwapug.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/19227861733.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/42282983796.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/a6e8a2fe40f48f55db05bad3ee4840c2/85081889306.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_off0000d75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75D 18952 bytes
SHA-256: 1f43df53616748781828434b881f8370be42f31f68dffd8e40676eef65d3fbb5
font_01_sfnt_off000108a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A0 10896 bytes
SHA-256: 4be84de1c9f66fbb937201061c3722cd554a058b6ee10e011eb5f7eb2a78f0ad
font_02_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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