Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a60fbb7428a42c3…

MALICIOUS

PDF

72.2 KB Created: 2021-07-10 01:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 59c6ef8fe947f873e632190373c34d16 SHA-1: 05dc79ba0981b01a6a1b024e66470d7db81515f9 SHA-256: 8a60fbb7428a42c32ee1d486e419660a93613a8ed28c70c70c24bb71ea4efd9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, including those hosted on compromised WordPress sites and disposable hosting, suggesting a link farm designed to lead users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=annals+of+functional+analysis+impact+factor PDF link annotation
    • https://tvmreza.tv/ckfinder/userfiles/files/7699767885.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/68111820109.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/sivosodukexovijepeduzig.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97b7d04eb8---86654156959.pdfIn PDF document text
    • http://isgsrl.it/images/file/boruzubumuj.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/dopufiroxaju.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8674f6a785d5a72d5fed3d7a68505808/rawexipov.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a552c164c---91312489212.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/rfpmguh853qokaj5dpagc35b39/16942662929.pdfIn PDF document text
    • http://unseretochter.com/images/file/67463710744.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a944da8dfa4acf1d96a4b037a54f07e1/zezuponoji.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e643c335e---sowujoti.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/5cae5c4065ca51df506363352812ae10/jobafibatigiworok.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/nugoboxebugejijirifud.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bunagafedelew.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/9af2482a0801cdc426e7d14d3b8fc4ff/50166787532.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25065236e1---48555865807.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ea8202a5f1bc677af64dfa88505ad25e/mazaretekitenit.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b48dd8a2f9d---50792548763.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/65694916331.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16228251021227494667.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad90c697d5d---taxajebegidubeminak.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/24/file/70515923020.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/dodizigamudojumotipu.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0640192b48---58010310423.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_off0000b9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 10704 bytes
SHA-256: 5d017f0728019433591213368898c3c777aa5b99fb48674c618eb88841cf3c61
font_02_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 15788 bytes
SHA-256: 3781ecea36a61cbda5d43a9a9dd6d208547d2c838c46ca92ba7aaf78ea3df108

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