Malicious PDF — malware analysis report

Static analysis result for SHA-256 de528c16a42fdfe7…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 08:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3103d0863cb0e4580c23b49af331d98a SHA-1: d3a02d04ab406dc3b8f8e1c76043fd13ea5f656a SHA-256: de528c16a42fdfe7d718fe1ba54468722ca3d4fd33f4aba7f2ce6935ec3c5e23
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 websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://mimpiindahsatu.com/contents/files/nawunedoxipisukar.pdf In PDF document text
    • http://siciny.pl/userfiles/file/97626876167.pdfIn PDF document text
    • http://hocomesun.com/upload/wozususokeloribor.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/98987524213.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/mazofawu.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/demajifijerirog.pdfIn PDF document text
    • https://limsurdua.com/contents/files/zokin.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/65400805645.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/kisakojupubiv.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/67745620553.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/penekodibaf.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/771b96d176026d0ba779c4d78ce5b3ce/luwefozivu.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/zukumus.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131bc528bccd---kofuzebubaxoboxufe.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/85520395385.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/zotukuvafenozijemosemi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2a6c2b20---zuxinigugadanositagomika.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136102f24d8a---mujoluba.pdfIn PDF document text
    • https://tumsad.org/img/editor/image/file/nigufufeg.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/92250161542.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5788df9384500e0080ea9b518d22f2d3/patizupuxe.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/pejaxadurak.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/62156137855.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/zajafererusa.pdfIn PDF document text
    • https://producto.works/userfiles/file/gaxofuniwobemexeramijoko.pdfIn PDF document text
    • http://video-cycling.de/files/file/xuwexofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=filipino+movies+onlinePDF link annotation
    • 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_off0000c3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EA 17320 bytes
SHA-256: 4007c8040e1d33ff6d3d63fe0f2164f2a70e354dece2f2b365ef84454ca78cce
font_01_sfnt_off0000f0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 10096 bytes
SHA-256: 64486e6cb59201ba19f3cc0e6cc45e3e54c6f1c4ccf76a55965b3154173a46a6

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