Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4427a2ad2496119…

MALICIOUS

PDF

82.5 KB Created: 2021-06-16 10:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 039d900fc9cce273eadf5d171106db9d SHA-1: ac9c3742ff0a3ae0c2aae9e671e38982c172fd63 SHA-256: b4427a2ad2496119f88f419b68c0ae45179b94f50d9d54e88bf06aa472faabf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=wii+sports+resort+iso+europe PDF link annotation
    • http://brmxn.com/userfiles/file/20210520124410_mmw6j1.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d5a42671---66977487997.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/zotikibetanimo.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/wuwusifotajovufumi.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/24126418212.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/rovolola.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/fovafoba.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/gifejip.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5c7234266e2b4a3dfa241018b072e3a4/datejubepelawomu.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/29d3b441062df6ef7f2408009bf59a04/xafotobudemudexokonag.pdfIn PDF document text
    • https://davaocarrental.com/images/file/widalazenisedenafemo.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/tabomesojeja.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160993b5e95010---juguvafuxumukafasuzuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 4096 bytes
SHA-256: d34516faeeae1fb09f313d156907b16f6d4deff0b9d4f531c65123c08c2f488e
font_01_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 4584 bytes
SHA-256: da47cfbc8654fdd5284d80548ab6c05efbf5834ec4f9bab0803230cfeeaf267f
font_02_sfnt_off0001168c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168C 11272 bytes
SHA-256: cd7af0fedd438508478b3e7aa193a26bb7fb1ac65dac8c4d236bfe665f0e063f

Open this report in the interactive analyzer, or submit your own file for analysis.