Malicious PDF — malware analysis report

Static analysis result for SHA-256 78116aee12ea891c…

MALICIOUS

PDF

74.5 KB Created: 2021-10-10 08:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 88ec2d159b1db5095af3b665a21800d7 SHA-1: b83a05433b8538a5ceaaf80084b39f08620662aa SHA-256: 78116aee12ea891c0940c01c8b4cd31ca0dbf37ef2d7995b25c4979b38c91611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised CMS upload storage, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the PDF structure itself is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hazeloyun.com/calisma2/files/uploads/66745293383.pdf In PDF document text
    • http://mybyblos.com/userfiles/file/50710553643.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161602cff68933---44535346798.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/vubijobokuguzamitidazixaj.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/tomoba.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vedikeganaxefujari.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/zekerego.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/56266268830.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/41692052915.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/tjnatlpu5cfejj70hc4ggq8gf0/57098907125.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/33050387861.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2206c6d2ba4bab997349de71694282fa/ladutowivadabanabi.pdfIn PDF document text
    • http://trevorhannant.com/gizafaxenusekinurigufi.pdfIn PDF document text
    • http://z500.si/files/dumuvejudav.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/betifero.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/27566936993.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0740b83281d9f91f221e56030a6e85ca/62686885215.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/16734594614.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210909162025.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/73062973398.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/28983221712.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/24275964816.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/31a4c6d8fb94b371d7adf51b4b406448/pefowireb.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/kejedufibaxifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=bricks+used+in+constructionPDF 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_off0000bddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDC 10400 bytes
SHA-256: abb0858765801d98d712a4433cc7f7860b887b720f2ce879bcb43fdbceb70c1f
font_01_sfnt_off0000d598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD598 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 17936 bytes
SHA-256: 714b5271720654c0453d9a423fed289febb03ff659dfced31eb0a88f9584331c

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