Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2575264c269c631…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 22:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e93285637e24a2a11fb1cf68bc81f21a SHA-1: d60b5cd247d7df8dedfac094e4fe01bcd2d0fc51 SHA-256: b2575264c269c631a841af03e4f95e93fa63f6c38a4203d5cd3a828756defe8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress upload storage and disposable hosting. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://nomylo.ru/uplcv?utm_term=set+up+pattern+lock+android PDF link annotation
    • https://noddy.nu/images/file/40753670182.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/99266730889.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/37778402287.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/10650707263.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/28186750640.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/61404943475.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/jaxazososepugasipab.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/19607432680.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/rudofow.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/11567166085.pdfIn PDF document text
    • http://abnicum.ru/files/file/wizelosebeku.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/jitowulujapafudoket.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a512f2f2d8---visezerovutisazumitare.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/nowiwomu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/jazabaluxixamedos.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/wadiranejexulezila.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/kipoxaraju.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161310042a8082---52133862702.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/90252696615.pdfIn PDF document text
    • http://fkhd.cz/data/img/77953687299.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/lurezulugik.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c32637a79---61583095813.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137abe5eff69---fabetunuwibezavoje.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/81598623085.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/jadakinosabedelorabolulo.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/23725417020.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/54034489275.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_off0000b34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34A 10608 bytes
SHA-256: 6695b4e1b765ff3217ca00eb64b0734133c72ac0fdaac15ae4790fc58ffe8cf7
font_01_sfnt_off0000cb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9A 15960 bytes
SHA-256: 16e8dff6b6b7d740ac89a7ac916671bb5c938a2b8704a8b224155f792c3fbca3
font_02_sfnt_off0000f432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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