Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9496e186f671e4…

MALICIOUS

PDF

84.7 KB Created: 2021-06-27 05:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3f006e450ddf927b89c35a6b804e57c SHA-1: 8b429ff19686134a404e2d83b3a930972b35eaf8 SHA-256: 6b9496e186f671e46b73c579106f487d2e4c97b2c4ee42777b8ad9c2e341a3f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution lure. The presence of multiple external URIs and the nature of the compromised CMS links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=group+pension+zone
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ac3ea36a---4683841190.pdf
    • http://hifi-markt.net/kunden/kronhardt/ckfinder/userfiles/files/rizotamexot.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607055ed9e416---jilalaxorefeweki.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/13ae5ff67e48c03dcbe841a179d817b1/47595384717.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/72384183348.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a91a1d0b---tixuvenuvuguxawekavekemil.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/fuzawesile.pdf
    • https://agrolliance.ca/ckfinder/userfiles/files/7465808939.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/p6eopvspvfqqjn4ipmh6gapvol/91104683677.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/btg3apedtqni37lb4hfjddp8t8/11687180244.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/vekasevonideveratutanezo.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/9238188093.pdf
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/ad660f0adcb5d9534467e3c36dff7e74/47421421744.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb59060ab2a---zufivizumanaxe.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/giborikaganoxuxobama.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a968f69684---69203525224.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2125dk20e7v8gnu3igospk2vrj/94372061813.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16098521c52228---45939693682.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d32e9d50e7---kobupeg.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bff3a703b2e276202cd186afe745e31a/pazenomofowalutor.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf2e1ca64---22479666089.pdf
    • https://cualuoihoanmy.com/uploads/userfiles/file/nuwizakabimixesarupaguf.pdf
    • http://naturallabs.fr/userfiles/file/57616071642.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_off0000eb24.bin
3f5cef90b519e134add4ad00f44fde0d3b3ec5f0c003a417948e734c68a48f2b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB24 10140 bytes
font_01_sfnt_off000101f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F1 16792 bytes
font_02_sfnt_off00011a03.bin
e1e6c95093385c89904c19bf73b6787c0d05aa9a3e407c745f7c28ffac18160f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A03 16920 bytes