Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1d32df4375a09d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-01 13:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4b252b979c62975ed2304feb6105d686 SHA-1: 6a493c7da4d84ce9857a1c30655434d9c4636c31 SHA-256: aa1d32df4375a09dcd6ae010aec42c3847759c3f5957f12be08ce5c5c70e5821
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, with several hosted on compromised or disposable domains. This suggests an attempt to lure users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aslplastic.com/ckfinder/userfiles/files/8768163254.pdf In PDF document text
    • http://wenxuezj.com/images/File/64376519080.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/pobiwirububunamini.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/64152504505.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50a9274815---nudabafujosabero.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/51596684247.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/xopozinewotuk.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d2322901a6a---45478430023.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/60074464712.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/guxoselaxure.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080966d702a5---daketobujo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d97a6c944c---50342126217.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b2d3178db---famipebujekalep.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6839162cf33d1d75b6d7415ab55bd96c/20606964206.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/63115915557.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7ad17a4af9d4e00677d2c6a27f2aa92f/jefigil.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/molalaxajuvejifiraman.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ldd5h9jegg6s6c5ighlscokti6/7447051092.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/62097160675.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/fekazim.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/smeup4gpbphm9sgiln8s13cqp4/noripadefevadewovoroxoxu.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/tebofabomogusolozifeli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=puzzler+world+2011+answersPDF 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_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16976 bytes
SHA-256: 909d5876db69ccea717621b3f597ab7f5d9342b3142c803c81c675e5a81d5c4c
font_02_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 10592 bytes
SHA-256: 9954f0142f7289911d06c488850a63f7f8a88c3d092f639eb4386aa05d71f3ed

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