Malicious PDF — malware analysis report

Static analysis result for SHA-256 01d14431eb1af1ae…

MALICIOUS

PDF

79.2 KB Created: 2021-09-02 11:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 283af71a6e4991b0444677a113a44bcb SHA-1: 91f4d8cd9a1af71f3c9ea52ee6465bc66eb8401f SHA-256: 01d14431eb1af1ae750b2f7b2866fe1617e6b4bbcdbf0ea7f997243e9678b681
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=infinitives+used+as+nouns+worksheets PDF link annotation
    • https://astefin.ro/ckfinder/userfiles/files/tunikatuzakoni.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/komaxavivag.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca26f0c9d8---dijumegesuzu.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/vuxibijepuzoweko.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b8ef133a---zubunafutobonixesuxelu.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-17/20210817040454964586.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/majoxagaxosilanovexazos.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/2k70kb5mossh8ena8id7ijbeul/mipotefabi.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/16100539370.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kekipifalomobibu.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/dibuxipiti.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/puzuf.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/83463dfab2e518b2944152b232a3f035/saxovep.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608130a4595b8---59554153766.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/lexotenatititugek.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/golexutibaxuzowobobexad.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afc68b96b3---8962042807.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/55370595256.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c613e2bad6e---jugijudadaxuzorawububopud.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/52196918669.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/15745273381.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_off0000d17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17F 17588 bytes
SHA-256: 33f650364373d3177f758430a58c1246849297b8056451bd9ff8b87428b6ae8e
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 10700 bytes
SHA-256: 3553cbb5de3dd77ffd4648905cdd3571168629c033356b721d3f14d39088a4fa
font_02_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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