Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04c151e438330da…

MALICIOUS

PDF

85.2 KB Created: 2021-09-20 18:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d7bb83580221e496ac6a3723f3470589 SHA-1: cc29fd88cac9f97d31a45457e2af44392ca3485e SHA-256: c04c151e438330daf4b9554c4301a160ba49082579c25a37c399f276824003c0
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 compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=android+auto+video+apps PDF link annotation
    • https://chptravel.ir/data/file/tuvejozuwe.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/tevivipomizufanij.pdfIn PDF document text
    • https://anandalaya.in/resources/file/vexatofikupokazuxoguk.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/tusadijoposakomi.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/60931491553.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/389q1eqnbku128aou9g8hc9r52/roviputivejanewivozufitub.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/71691105467.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/1753826109.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16146ae24dc4dd---25706900639.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/81480126257.pdfIn PDF document text
    • https://trainova.com/userfiles/file/lilixomibizog.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/tafile.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/54652495283.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/15501861528.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/83661026307.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/92914050498.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/vinalovute.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/79633682162.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/51213054675.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/18353405424.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354fee3a4bc---tiwoxatoduzigug.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/lakitukenamotevawupa.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/44233911656.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/29215441408.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/vomibajorilugeme.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e85862a6e6---55030356609.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_off0000e7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CD 10484 bytes
SHA-256: c9929e04392d695c87db0e6659c635cd2e7fd9e39ef92cf1d3fda7fb6daeabe5
font_01_sfnt_off0000ffcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 18340 bytes
SHA-256: 14c986b6e14f2d9a636e05ea63fecbcae205d8cd0bbfa6a89cd984382d123ddb

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