Malicious PDF — malware analysis report

Static analysis result for SHA-256 a232559169864bc0…

MALICIOUS

PDF

104.8 KB Created: 2021-08-12 06:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8eae19c5df39bcb34d5da35746d7de30 SHA-1: a53175035dcb9677228f144e1af58757f1139707 SHA-256: a232559169864bc0192ff75a364d51c4d20919df140cecf9e53cf2765c51d125
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate it's a link farm and potentially a phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wastran.ru/uplcv?utm_term=cristiano+de+la+secreta+pelicula+completa+descargar+gratis PDF link annotation
    • http://budka39.ru/files/botubelufuvutekozow.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/35v15akdsd015m1uj0queopv17/58690863975.pdfIn PDF document text
    • http://standdominica.org/files/files/39407162886.pdfIn PDF document text
    • https://diphong.com/uploads/1458513596.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad6542bac0---28866446169.pdfIn PDF document text
    • https://33mobility.net/uploads/files/ponozilukomumovanezu.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/mokuv.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/17719326672.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/63694762360.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607461e89319f---vixojupux.pdfIn PDF document text
    • https://majubesar.com/contents//files/kepesujenomufotunalotuxaw.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/nasalolifo.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/fiboxebedusaposatevenif.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ubvjsgu6q7smkdjvit8c3msae3/gifalum.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/59232958860.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/1493024920.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/kdqdnbvvn0eona29f6vvilpr7d/sotanunumap.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/gilixutiwikuwogajur.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/dibupivomitano.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/xaxoxeronuvobejosaz.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/mokosiwezo.pdfIn PDF document text
    • https://heyratacademy.ir/file/57496372596.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/69747823945.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b229d619d4---wezanovixikudowi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930cbe52ba5---86221384675.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_off000130b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 19140 bytes
SHA-256: 9347451dc4ad7916770afbda5950f51093397183969c9b5624822c273181863d
font_01_sfnt_off00016159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16159 10988 bytes
SHA-256: 8e59de9f58e71019599edf8686c952f8086089ad6b392c780cbac641bb140f10
font_02_sfnt_off00017aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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