Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b7dd1498eadcb5…

MALICIOUS

PDF

98.2 KB Created: 2021-06-30 19:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f590fd002c9d6902b031624e5597d0a9 SHA-1: 2f947f9e43f7726333775253ce6eeb35a3ee008a SHA-256: c6b7dd1498eadcb53e9d7a1dde9879b09e11c2648d0a16a3909ef6063191c2a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, as these are common tactics for distributing malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://ketchas.ru/uplcv?utm_term=fatality+mortal+kombat+unchained+psp PDF link annotation
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/f50qalhc1t4b5vsbaa2eenl8o2/3504956175.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/62303875187.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba94c5feed---lifonekixijujujaxumizo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/fixitevote.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95ff12d36---xirav.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/naxaz.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/zivudukewulez.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/d943050b19089f61906b65b430b7d871/25218089341.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815fe84ba01---97021454654.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ac838bee---xabatemit.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/subonatijuxojeku.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4de8b064a4a93fa0f843e59ca10bc078/jinenupa.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210602054626183.pdfIn PDF document text
    • https://pindimana.in/uploads/file/gederavufujimataliva.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14183e0bb---92505142751.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d7446293dd24e79bb1dcbfa0cfc90785/99042969546.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/a542dd5b37ccc12f5aa13b664fb33eee/52851359558.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/84621dd36a5fed8579cbe65d1411003a/4583842396.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8877b06e5---36136943591.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/0lu4cfciq38uj0289qq7qmm905g6l7dl/kuxudopafafisututut.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ead3802d32865714f58eb8a78c78ff85/52311034305.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/33759204557.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tinujilode.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fupinekebosejiwoziwozelil.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_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001330c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330C 11200 bytes
SHA-256: 9dc708848f569927d022873c7bc7e06bcdd177ade11edb8509b699aefa3835c8
font_02_sfnt_off00014cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 18160 bytes
SHA-256: 2a3153d2e0f4f9ef74f790390b52837de381d9afc85873f61579bfb465fee8c4

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