Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c9396efc51e470…

MALICIOUS

PDF

109.5 KB Created: 2021-07-14 09:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43cc09b04e4edf9208f5bc334151f9d0 SHA-1: dfffdc2621008e35d79e1369483c5d3585eff58b SHA-256: 94c9396efc51e4707a823997bcc99fa21880af79ab7a912fa767b237473d8138
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms on potentially disposable hosting further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9792

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://crysiq.ru/uplcv?utm_term=titian+equestrian+portrait+of+charles+v PDF link annotation
    • https://affordans.com/ckfinder/userfiles/files/pakafiz.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/86206277061.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/7mbl2hbeh1akuh9uteckqergg0/mapisujudofu.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/bimisarubiwupalepowuf.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/551f3b0bba0ecfa3c9fc08d8e82406c8/27265129842.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16083bcecb3a0e---fuvoburimoranodoxot.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba9bfde0c8---zuzemamegadupefelor.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609794f66e1cc---pasoso.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/bofuvenexijifusizos.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/32833898751.pdfIn PDF document text
    • https://bamor.org/userfiles/file/xofev.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16097c44ab9a47---59239324452.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa550879ce---dagolebavarorowelusa.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfb86aa34f---devunaxubugasikufiluj.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be40bfbc848---81911097196.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/09c2e1889c39ba40e9cc6e2ea1a7b521/62564765109.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d91781937---1754373224.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ae3d98c6d---fafubumepitakewidugilipa.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/xulunazinoletuzebe.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b187964e94---49669554816.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/bixatujaz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec34994e0---faxepizasigokamozori.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 19156 bytes
SHA-256: 0a8419e06970d03f9403b35aa46aedb7526866e06af5e41dd76755b927132f14
font_02_sfnt_off00014565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14565 10852 bytes
SHA-256: 8a9c3a63bf5e4e51e1d25b8ec72384c126a171858f299d61601de70706ecb59b
font_03_sfnt_off00015e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E61 4400 bytes
SHA-256: 2ad241c1e237fdcdfa338a4359e062c321b25ee70d581cf3b4849caf705c1087
font_04_sfnt_off00016e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3F 23476 bytes
SHA-256: 3feed491595dfb893d2ca10246b935cb2232add9c00cd93b95a45bacc782e263

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