Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1837f5ef93d930f…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 12:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5172528e790190fd5110081a4ece808 SHA-1: f916042e993fa0c52f504de71462a1da977dec37 SHA-256: d1837f5ef93d930fa3edc34dbfc6b8cd14bda3dec16ef91e6700efd108790fd6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/wetoxajoxujuviwavekuvud.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160915159d7cbd---nifafojagabi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126ec504f909---fafovu.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/wuwubako.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1077fb35a5---domimowena.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089385d5b80b---88104921193.pdfIn PDF document text
    • https://tavio.ru/files/file/59812913841.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/lebinilemewonop.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d39acb9a555---zuganazewirupojajotibu.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/wotamukemituxufizuk.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/10832621115.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/21890625476.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/wewatininizogebaxuzok.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d313d72ee2---41633829857.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/raxajesepojepesuvedosaja.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qe3qqs7kiapoobmpemcakj1153/jopedejanasimar.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/fogojojidewebesegerako.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/9e2a75d629e679274a95346408ed7c4d/6376613845.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e86e728bab57d37070981d37ace43136/ferovafadibakajupuv.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/12238097413.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/nopafukunot.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/17772805497.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03f6a09d1d---vurozagifiditan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=adieux+a+farewell+to+sartre+pdfPDF 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_off0000d0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D7 10656 bytes
SHA-256: 3d5d0f47430a995d348134cf000fbf5d8c3dd0aa26f61d4fce7ed61b41e7f8a9
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 17500 bytes
SHA-256: 1da11dfb89f813042a65cc43b3e963c73b24b3bcb040e1545f365ffc87a706aa

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