Malicious PDF — malware analysis report

Static analysis result for SHA-256 f001df506918d615…

MALICIOUS

PDF

100.2 KB Created: 2021-07-02 09:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cc7a50c8ba4f6c7deb0bde13d046c3d SHA-1: 34135656efe6ac1fc7ab0019a3f576ca80eb3e01 SHA-256: f001df506918d6153109f7663566657a2fa45d13c9e0ff1a23ead4f39e85a574
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics confirms the document's role in directing users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://crewmak.ru/uplcv?utm_term=use+wobble+in+a+sentence PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb75a2b22c---18132229494.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/17174522783.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/72004645893.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796ee03b39b---telowawusafabipitijalarit.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16074152e08791---24390632212.pdfIn PDF document text
    • https://flyfinz.com/userfiles/files/32176998435.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/zuxizojotelomuvosas.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/9501596295.pdfIn PDF document text
    • https://hgb.se/filer/file/rolazemokazeme.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/jnu70g1s4mfgdctj07h0dntq7v/vofavotibivepupew.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7882a8d71---30716413988.pdfIn PDF document text
    • http://mobiliteit.nu/files/zaworubajimewugijavewa.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/95062a802004ffa7c56c98d653b91c51/1625631053.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9ecc8987f---kilomotolir.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609064465b419---76170512284.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5s9eg5m92j4tgrh3j634krgdik/tupezi.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210616071955.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54cc97290a---magopexowekexefuvofobid.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/16559229775.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7b4cab2a---12544980003.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785e02b4d35---67383999897.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2c3665288854c3e51ea0d1fadfed0e61/ruvolomizaga.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c40eed2a---legodutebotalaju.pdfIn PDF document text
    • http://abnicum.com/files/file/19245945143.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_off00012945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14157 16564 bytes
SHA-256: 63a27639a83ec0a0b3135bc608aaa2c89a0b3b2ca68b5c931f702f1b0925a41d
font_02_sfnt_off00016c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C1E 10356 bytes
SHA-256: 208415f930de0711aa83e2c014d62ebf4794d5a96d737b50a099fb0261eed575

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