Malicious PDF — malware analysis report

Static analysis result for SHA-256 557e97326e93c303…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 07:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d9727ccae53501b2ec2ae90551122ba SHA-1: cdeb895f1cc5a2e3b9e0cfee9a416c9dd58d3497 SHA-256: 557e97326e93c3038075a617cbdad1d225833035772a4419cab4193cace97000
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or malware distribution lure. The presence of numerous URLs suggests an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://irlanc.ru/uplcv?utm_term=spiderman+toxic+city+apk
    • http://sunwisechem.com/Uploadfiles/files/22549935727.pdf
    • http://asijskepotraviny.cz/files/file/jogekeduranos.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/91166560272.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/097f77d0ac7be09339ba99b2b513e2bc/nevovop.pdf
    • http://misosmile.com/upload/editor/files/juregukoviwadamasegopogu.pdf
    • http://www.pes.edu.mn/ckfinder/userfiles/files/jesabasopaje.pdf
    • http://devveb.net/userfiles/file/26742429177.pdf
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/99152466786.pdf
    • http://alhouti.com/userfiles/file/78494775779.pdf
    • https://value.ae/userfiles/file/gateluxivusipomaxa.pdf
    • http://xn--m1age8bh.xn--p1ai/files/file/najufulotanup.pdf
    • http://artechq8.com/beta/uploads/files/57988510433.pdf
    • http://civicwomen.com/ckfiles/files/biralujegapopigelot.pdf
    • http://k12kos.com/ckfinder/userfiles/files/96908702721.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16130663f99828---77113544316.pdf
    • https://aromamarketing.md/img/files/61993199351.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/d483eee65ace59ec6f94cbfa9da3c69c/lomuwolu.pdf
    • http://derkwoo.com/upload/editor/files/wiwosesewalaxunek.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142586834277---wenir.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb848c8be6---20740756588.pdf
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/kutisasazub.pdf
    • https://xulynuocphangiathinh.vn/images/pic/file/29011470991.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da60.bin
2c53c064bb0532fe7838eb2bbc2f21941f8ec71540339ddffacd6dec59940e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA60 24460 bytes
font_01_sfnt_off00011751.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 16792 bytes
font_02_sfnt_off00012f68.bin
d542bd73f54cf8396918516e99b887745f3da2258407f892ab69dc8582a9dcef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 10844 bytes

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