Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a40f18f906fc26…

MALICIOUS

PDF

76.5 KB Created: 2021-09-16 16:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdc60c93708aa993332312ab3f307e3c SHA-1: 63d7847e648a0f15f4262ae024d84a26213408ed SHA-256: 11a40f18f906fc26bb1d4fff50ffa38b7e95ce8fd8b51f1abeb9899e7dc21f11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=sensor+music+player+apk PDF link annotation
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/29ae4241d87640842f9f6accbbabd7de/89029838267.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/batijewerokogizi.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/jusazufeto.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/tonopavaforuger.pdfIn PDF document text
    • http://accronline.com/userfiles/file/29132262823.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/34889944202.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/buxukikivikidezaremofo.pdfIn PDF document text
    • https://ptogel2.com/contents/files/18557734601.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/38746049712.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142f63277687---8913080565.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/52877637689.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/88123627477.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/93181290377.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/mikobeso.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/zevaduku.pdfIn PDF document text
    • http://fourfoods.com/images/files/82551652078.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/6824831376.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/229598d43eacf50a27fea70d2eec2470/10365931130.pdfIn PDF document text
    • http://chenruichem.com/upload/files/59635638389.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/dozugawegojekekol.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/43239840966.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/jafobagerulurovapo.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43332975863.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161363cbfa8511---61013705887.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/ripugezufukugenezizifo.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/75690965551.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_off0000be73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 10816 bytes
SHA-256: ec8bb89f5bd1aa9beb8ba5bd100a77f8b42ed3543f772235d8dd0e2cca5ad0d2
font_02_sfnt_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 20296 bytes
SHA-256: 7826d58479e1fbe8d08a270a8953c2249e5985154d424f94bbb6881f157e1c1e

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