Malicious PDF — malware analysis report

Static analysis result for SHA-256 853345abc3637bc4…

MALICIOUS

PDF

78.2 KB Created: 2021-07-03 00:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c87363afbfd09aea655bf1c4249eb76d SHA-1: 6c7a05b31d86bda4c84a94180ec9520b6f00eba4 SHA-256: 853345abc3637bc4e2ed746d844cc727720d37ddd6e09ebe5c011fabb2fd7a68
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://timeyear-v.com/userfiles/file/kafigamumoteragatifiw.pdf In PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8771651a0---49781751984.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c4482253305---rujud.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/10764050208.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/woxiroxesirit.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4a4ad822d---36809542408.pdfIn PDF document text
    • http://aceranalitik.com/ckfinder/userfiles/files/papiwokavoxoxozabo.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/82182ca34d43b95d07315864473c35e8/66775948111.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/k2i8s49p6qqaka6235m59a03v7/vezewika.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/pezovenogunozajorokipuzum.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210702140949.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/badomabidusabubu.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160761712096cb---24044220533.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e936a27a---mexaneturemolifowe.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/81163758893.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/s64vq9e7ucn9jls3bociorhhc6/kusomejorifuxudedunir.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7b293774---dapipasaxazifukexigiw.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/rasawisasodawerixaguramok.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a510253e9---zarotakibuwisenut.pdfIn PDF document text
    • https://yuss.it/file/kukulabu.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbc0d03b8f---36575731274.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/443f222002e8920e3dfe614bfe11acd8/sebogofawufujus.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3a9606318ebbea62f450ef7eacbe171f/41992492249.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/79677087738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=intended+telugu+meaningPDF 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_off0000c612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC612 10252 bytes
SHA-256: 7a7a815fbd4795f548929e5e03793d45a4a3fb05fb990e5e8bcf22cce5939947
font_01_sfnt_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 19912 bytes
SHA-256: ac161fb0ab49af1d8ee7e3f4236aa04302bc0a2ee60c275989446bbcdbe8f550
font_02_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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