Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b535180b90df97a…

MALICIOUS

PDF

98.6 KB Created: 2021-08-11 09:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7ef55995f31ce3d4fe5c30252bcae57e SHA-1: f0e6ddf8184c63443ccfb4e12a7f09558c640c73 SHA-256: 6b535180b90df97a131f507f75837b4a62611b77cd530a86811bd27129864086
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains identified as disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bebelino.ru/userfiles/file/buxirasu.pdf In PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0btvafuoj3cvg7100qkanmtl52/20498199729.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64e1b028c548a5b40e58cdeb54eae927/7167254217.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16247954457224.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/jafuliwetipujeg.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfd0d401c1---48022639401.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2vqlats3pog254509do9p1mbi6/lelipenejuzapal.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160782ce9f2530---23511211739.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/9567f6ccd6565ed643a2f32e6252c2a9/difabajuvuxew.pdfIn PDF document text
    • https://dm288.rs/slicice/file/57254361164.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/96c6a06792c66cc3f74d6ed1489ff745/32939212268.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgt5p4cjh4b3r3tfk65aofp7c7/wobimajunoriv.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/70587216497.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089814e65bef---4831683198.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/wuvas.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/wapatogus.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/df0b9a14391c75310c6be68aa13c78e1/70667058886.pdfIn PDF document text
    • http://maihome.hu/admin1/file/39274645724.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/34848143682.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/9d5322ca9abf3beca2f4ed155492e12f/wologubamarurarusufijibo.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/gulebobinapefevi.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/fezagatelagetumir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=subway+surf+hile+oyunculu+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3E 10988 bytes
SHA-256: cacd0bcdcfeb786a2f71097e1c83cb5152b2a2f38f987dcc5b4b72319040a8d6
font_02_sfnt_off000135b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B8 19048 bytes
SHA-256: 2c0707ca155ebf6dd0e88c3e964c0d4f8d446fefd8c868eb0301c81a28015fcc
font_03_sfnt_off0001643e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1643E 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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