Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c3c85271ff2da77…

MALICIOUS

PDF

89.7 KB Created: 2021-06-27 12:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a857ecb622b931e1c0c798679534fcd6 SHA-1: c2bbe5d3884dd7ff4b7ebdb7d160259785c35583 SHA-256: 3c3c85271ff2da7708c4e4104c8dfc25236c5ba1feeafa42d520a276a992f233
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, likely to distribute further malicious content or lead users to phishing pages. No scripts were extracted, but the presence of numerous external links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://sun-tes.ru/files/file/86347874602.pdf
    • http://thaide.org/userfiles/file/84975289215.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ae10857e93551c86ddf6043347c4481a/vajirozegamivigemisumab.pdf
    • https://amatnieks.com/pictures/image/gulutefir.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2629c4c03---giduwobalukojokijebu.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/4e17c648cb16b9ff556d37fcc88063af/61281268271.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d9ec8521---47759718169.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/l1d0g9h9vm0ogaj6d82da0kg8c/43314811217.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//60256663779.pdf
    • https://thehero88vip.com/ckfinder/images_store/files/nogarizawidoragovenomi.pdf
    • http://art-lan.ru/uploads/assets/file/32442155363.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a278e3b80bd---relale.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608453fccb7ca---59515228797.pdf
    • http://chongros.com/userData/board/file/17712076111.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160873bf4d9dba---43099232193.pdf
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/58976733392.pdf
    • http://mikomisushiwc.com/uploads/files/jawowakeso.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160803006c99ee---63502395383.pdf
    • https://heatingboiler.ca/fck_upload/file/xutuzapulopevakazup.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5000939a38---panajimovur.pdf
    • http://bandenplaats.nl/cmsimages/file/febabagoreloxepijuwodude.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16091c61352856---digovexozuwewozotikoxeja.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff4e62b483---3997769436.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+are+limit+and+stop+limit+orders
    • 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_off0000f9c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 16792 bytes
font_01_sfnt_off000111e0.bin
b25f327cfd79ef1726308e1957771fbc850bb26fb321142e8ad6b64fe9984b9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 10652 bytes
font_02_sfnt_off00012a0f.bin
da974f1b59fdfffa2843ff60e693e5b3bbfd5a6d606fa5fb19046fb20dd14bd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 17936 bytes