Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cd2ee159d19bd5…

MALICIOUS

PDF

75.7 KB Created: 2021-09-26 07:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2efed82aa9576ca80a88b3ffef1db8a6 SHA-1: 7b46f64919d320b13fd80c97d76cf9901973105a SHA-256: a9cd2ee159d19bd5d920afe836e22468bb93fa06e08f4ee17febd81fe7bcc02f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://inwebjor.ru/uplcv?utm_term=spinoza+ethica+latin+pdf PDF link annotation
    • https://alkalacarservice.com/public_html/userfiles/file/77509620643.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/jeratafepiri.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/wosepivigexoninatigebego.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/0f6ed1def74b90fe2192d874e24fc14a/24214021897.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/dovuxetisilodu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/12013989818.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/95632645840.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f53bee9118---18650093369.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/duxekobegofodaxo.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/doubb460fp7ts6hadppcug67u5/dutawebevifipudusolekisa.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/2801602368.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/52406665327.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/zakevelawiboni.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/zigagijilaromezi.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/wesuviw.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/lopegatitalezaxupomuw.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/pulisodiwomupugum.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c5843a72---1913293394.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/83788756771.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/muxibatabosivuw.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/44308160832.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/tuvunilig.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/6032128361.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/gokujejefixapexumizutoli.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_off0000bc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5C 10584 bytes
SHA-256: 988c61a77ec8c665252ce48028cdaa5a5817954c27496afc2eeb15892a6c06c4
font_01_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 20012 bytes
SHA-256: 464e3b194fe85dc870bbe7b69cfd965cc69d0ceb8b5e83ff7401b1f0a9d663c6
font_02_sfnt_off000108d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1