Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b967587b4d5e173…

MALICIOUS

PDF

90.6 KB Created: 2021-08-07 04:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8775de9b6b959e95e3d54ea9ccf9d43 SHA-1: f5bd91775aae15cb21fbc0d030f453384cb38172 SHA-256: 8b967587b4d5e17377c559b71d812d040269db1511275545a00f6de608d7dc33
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing destinations. The URL 'https://cructi.ru/uplcv?utm_term=xbox+series+x+walmart+twitter' indicates a potential lure related to popular product searches.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://cructi.ru/uplcv?utm_term=xbox+series+x+walmart+twitter
    • http://ajivikafinance.com/userfiles/file/69566115645.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/7cbccc77d1c2ede41a9fb7a41e3a10b7/28683739416.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a0b23195c---19245260615.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813c0e4e851---paguwazidalekapuwujigaf.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c79371813f---37084626531.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/hnec9ikghk7cdj6bf8mpr41uql/94998754029.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7b6hevudf9jhj1pvrkh4221it6/walanuvanexolerilobunid.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03efcec73a---85489024882.pdf
    • http://chronocertif.com/userfiles/file/pajirepo.pdf
    • http://ropesadventure.com/d/files/41244657768.pdf
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/18767499135.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/50btsvok3980hjsn582rrma2j5/xopapovapel.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4007f85906---lajeritaje.pdf
    • http://citadelcaralarms.com/userfiles/file/58397775758.pdf
    • http://olympusflights.com/files/files/kinaxixanasofim.pdf
    • https://branchennachweis.eu/userfiles/file/gabusakozutajaredaj.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b0468f85---kegojuwujezowedefu.pdf
    • http://bannhuaduong.net/upload/files/11179659007.pdf
    • http://abwingssuffolk1.com/uploads/files/15546967890.pdf
    • http://classtool.info/upload/files/jejasafitikokameli.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/rl1heo4hoqli7rfavosqnq37sb/buwovokoxefuberipegivap.pdf
    • https://kawanmto.net/contents//files/37317673003.pdf
    • http://bmsorganica.com/userfiles/file/45049458113.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_off0000fe1f.bin
7cfe924bf504add3af8ca936e11581706628f12f077e4f15467d43fce0d233ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1F 17412 bytes
font_01_sfnt_off00012bc6.bin
377409568c85eab9eaf353f575de992d3a0b5ebb0a5a06e1715c5998ad04fca9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC6 10500 bytes
font_02_sfnt_off000143be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143BE 16792 bytes