Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17cbeeac6528a58…

MALICIOUS

PDF

87.0 KB Created: 2021-06-28 08:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8046e56fcc6757e1a41c4b65c134444e SHA-1: fbeb8293bc52359b7f4debf7d5e974de5cdfd25b SHA-256: c17cbeeac6528a588418d6bf538a68ba6dc3441f59a0b76ea16ea15d36aebcf1
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on compromised CMS upload storage and disposable hosting, pointing to numerous URLs. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/2804595163.pdf
    • http://mclarenquartz.in/ci/userfiles/files/28785544861.pdf
    • http://activesolutionelectric.com/images/file/75373489621.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d197f2a40c85482af219ffb6390625d/lowedoguxazepesogariwapaj.pdf
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/d90d1edb9e7ecc8280e0582d7cc1f687/54131796658.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/32905071317.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/819520347c7ac5a91f6f6d090f289b9c/12184849410.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099a33d971bc---45634902507.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6f371ef10f2c2109c2390e092e9b936e/danivomenama.pdf
    • http://bidmitt.com/img/files/file/kedolijavemu.pdf
    • http://citadelcaralarms.com/userfiles/file/febolokusivuf.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o3qu2gsepla71gd1t6jfc5v5jj/wuzorerena.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6a1bd188---48204321194.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607784d31f73c---93822942017.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/1b5986486737484ada164422958c6022/jujigu.pdf
    • http://policylic.com/uploads/files/40442616696.pdf
    • http://tivatijapan.com/uploads/userfiles/file/80141128136.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/653c69a61df5dcb65848b56b4f32691f/jemaf.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/782fdde55649cbb063965325bdb00768/78274712821.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c97b5ee07e8---98229890300.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f62bdc3ed7f8808367df1dab11d2b1d3/32969516260.pdf
    • https://menu2uplus.com/images/file/xenerezurafu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/5e2f13a64d542341c9ad2bcef2a77c17/32038773576.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/1456564bc118f4dd84d15c0c46d692fe/zoxivukonuvonoditexevud.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/957821863583afcd65d311025605ae2d/22655562198.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/26b967d9a293d72ac0857c30048d0b2a/61921485582.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=the+harder+you+work+the+luckier+you+get
    • 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_off0000efe7.bin
88ce767636e3710f1e3a2b9809396f6a68cc194a5cfd65a0df7f42b9d067806d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 10732 bytes
font_01_sfnt_off0001088d.bin
dbe243493d033786868d9a6dc6802c5eb9c7073def098d9dcd60f4fcd01bd41f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1088D 16900 bytes
font_02_sfnt_off000134ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AB 16792 bytes