Malicious PDF — malware analysis report

Static analysis result for SHA-256 69dd7885dcff881c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 14:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c7f38e4f0ce82fc334f025b6b41a4612 SHA-1: be32948091345d41329580aa9a4d79f27481a959 SHA-256: 69dd7885dcff881caa681bd2f89ca27e0e354b9cd91284172bb106700a6f7642
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://giprozdraw.ru/ckfinder/userfiles/files/26981317427.pdf In PDF document text
    • https://liho.cz/UserFiles/File/wumosexigakivositipuvuze.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/9155172245.pdfIn PDF document text
    • http://changjiujz.com/uploads/files/202109060307547042.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/tuzokitonosejoj.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320c90a0a7f---41898076313.pdfIn PDF document text
    • https://sinarwaja.com/account/files/vifojeniwopamukuguzitafer.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/tatizasuvekamuw.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/43696638627.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/57643524514.pdfIn PDF document text
    • http://djpress.pl/Image/files/zarojazidojotivo.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jatejufugojinesazesis.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/zerowowijodulozife.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/popominozo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/40707373169.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/14330539503.pdfIn PDF document text
    • http://rococosofa.com/files/files/31735813357.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/64215115637.pdfIn PDF document text
    • https://seger.cz/userfiles/file/zezavasozej.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/tarapuge.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/raziridagumen.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613688e4a08aa---27015750960.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613650107c61b---tamuga.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8b128a6d---govosekumejewow.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398440d1362---nezabixi.pdfIn PDF document text
    • http://chugguwang.com/files/fckeditor/file/62215546108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+ice+cream+game+on+frivPDF 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_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 10500 bytes
SHA-256: fda3b32a9a6af54a77456b1fa99d89b9d5fe00e34e7fb64e0c647a486024f335
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 17324 bytes
SHA-256: 5dc64ffd53773265c2d16122aed63a2b3b937ce6f360a87d2b2e7b8b82078c5c

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