Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d96acbd7ee6bb8…

MALICIOUS

PDF

82.6 KB Created: 2021-06-26 09:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 161162604ec371227a171c42925ce950 SHA-1: 914d144caaf463faaa1e0f7aca5785f0033e9104 SHA-256: d9d96acbd7ee6bb880831a63bdbc9fbe77359e2e2c37c9f6a1fd006331a596df
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=poarch+creek+indian+jobs
    • https://easy2ticket.com/upload/files/seragumiruzagagow.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/bb42b6d7998c538eef1f35987f09b111/91529204233.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/ef83bb60e12725c0a4316a8f729e278b/xawozivetatirupu.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1966ca9e9---62944522488.pdf
    • http://hainescentreasia.com/images/file/fuzoxuzumolifiporokera.pdf
    • https://hgindustrial.eu/userfiles/files/72185131203.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/r0vcfv5h7sko906732crepcn9a/16551447747.pdf
    • http://hgbs.de/userfiles/file/sidubujesojotifizu.pdf
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/mak3l1gttig37emjmdju9tu6eq/64517482913.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/adf07996cff20e5f94edf1a51b7ef2ac/narukenegatojuduwalezij.pdf
    • http://cuatudongsaigon.vn/uploads/files/87846221621.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2beb226418---dikadufujunagodi.pdf
    • https://dbjadow.pl/attachments/file/ronojujib.pdf
    • http://midel.me/userfiles/file/83676034220.pdf
    • http://fatamorgana.fr/uploads/assets/file/71394846532.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160807ce818d19---50748045282.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a3bcb0562---70549295723.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091c9112a0c9---bekidodevewa.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160830b351d21e---45155319663.pdf
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/ff63024f0920fe8663d529e49cfb38e1/76364626419.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fc246c5c8456a2cdfc6aa915b682d25b/xiganovazupuzan.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd357548989---42298483879.pdf
    • http://em-mould.com/ckfinder/userfiles/files/zevunesul.pdf
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/223848b268e035e7a366c32bd8401a51/zexoga.pdf
    • http://afghansolar.com/userfiles/file/43035078077.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce1.bin
45e30cf4691eb7328190939372c4406f4716c0bc68e6bcd0afe7b319a3e70ad9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 18080 bytes
font_01_sfnt_off00010ca0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 16792 bytes
font_02_sfnt_off000124b7.bin
031a751f441e8c261d6e51a73261426c4d3ee87b2dadf6777c1c7b921d6ec36a
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B7 10688 bytes