Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f01b13fcdbea0b3…

MALICIOUS

PDF

85.2 KB Created: 2021-06-25 12:26:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54a0e4ad9fb3e12b36ca98772f3c1dde SHA-1: 2b4e0da7462717af43e5f6eefcf4ca3bd2786a71 SHA-256: 8f01b13fcdbea0b3f2a539906778a09963136d181f1adb17e3df5332262a35df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/uplcv?utm_term=what+is+the+best+answer
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b348952921045c100289390351422b98/dexopexuf.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9581a1ddda---juxenosunerevebube.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6b887f8cd0ad8d275cfa86db954e100f/fazijemazaned.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lflcep26m83ichgbihm9jvh2ge/medudelovaralubuzamozes.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a6514ce04fec9c4ce8cb560bfd8acd34/14194182924.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1575d1af51e01eeb70fd3a62cae798ba/67143338276.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/j5p8ljj1in360v2oatj0idolc7/tuluge.pdf
    • http://zulassung4you.de/bilder/file/5212779302.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d4f549f6a---nasepemipujato.pdf
    • http://china-hold.com/UploadFile/file/20210516221828168.pdf
    • https://motelandratecuci.ro/userfiles/file/pafuziv.pdf
    • https://stcc-sa.com/motakamel/Ups/files/73477803836.pdf
    • http://veterinariomauracotti.it/userfiles/files/28078997542.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/67843818959.pdf
    • http://aqbnb.com/uploadfile/file/65971242009.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee91.bin
993fa0ae1b70e1860cd9dfd7656683c121f03be953990daaa862c3143b4fea32		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE91 16640 bytes
font_01_sfnt_off0001190c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 16792 bytes
font_02_sfnt_off00013123.bin
2181720d48a1d5543cb940e67ceeb5d347924ca177206fed8fdf476fa5e68f06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13123 10256 bytes

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