Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71dc35d1183e414…

MALICIOUS

PDF

80.1 KB Created: 2021-09-13 13:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: affdb95b93fb732640ca6d3b1b622736 SHA-1: 3a6f92571d3aed89138c7e897cd5bdbaa5b10ad4 SHA-256: d71dc35d1183e414f4ce4f9a478ed3fa27f9bbe429f1dc934de3f074e9a77877
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are characteristic of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://magiepourenfants.com/images/mediamanager/file/21515453316.pdf In PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/39814787190.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/13552845027.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d240dc7a95---kejipesenutu.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tevamogesebukevodepu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/33952926579.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/rusadoxilejadegu.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/repob.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/92658509349.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/eed831b637d4eb942b3460c8423cf5ef/wabotomugifikadalavozige.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f230fe229a---situfizewoxivozujazu.pdfIn PDF document text
    • http://flirdining.com/uploads/files/bimizosedimutipoforibuz.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rogenomabadadozoki.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/93448968978.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/boxilumaratijun.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/44642012783.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/91258054077.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/dujotepuvo.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/93812234347.pdfIn PDF document text
    • http://www.bash.cl/media/file/27290565276.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/73608782973.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/71784786105.pdfIn PDF document text
    • http://4bx.pl/public/file/76441558724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=craftsman+apk+for+pcPDF link annotation
    • 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_off0000d556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 17516 bytes
SHA-256: 983e0ae9348512a3db0988a678b3c2009948e45e56b0b43baa5b7614d6c7030d
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 10496 bytes
SHA-256: 8a7d0558e699c018535261a0bbe1ad26000d9bca7122b55a54c541ad06ad3af1