Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa422cc2626a86b0…

MALICIOUS

PDF

95.5 KB Created: 2021-07-08 00:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71ee99ec0b5a95f15f6f49c226329f12 SHA-1: c008e75c15c0a4b0e9aff6688b1102cdf1f32367 SHA-256: aa422cc2626a86b0f04ce4eb742a8008a9d0dadba5a3693f896bd3a7252aac2d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The 'SE_CLICKFIX' heuristic indicates social engineering tactics designed to trick users into executing commands, suggesting an attempt to bypass security measures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://archism.ru/uplcv?utm_term=minecraft+java+edition+for+free+pc
    • https://patc.fr/imagesfile/kumeloxi.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/29ig8q1k8oaqdquf1avq0vhtc3/dexiwaveb.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/39298105076.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e64418fad65daedcdbb3d7b505ff1ab7/berulafid.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8a4377cd8d7d3fa1459e0b87359c71b3/16881107101.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1da32f0a1c---53417788077.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaff1b3201---50047092180.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/wuritu.pdf
    • https://aymsoft.us/aym_image/files/47065167336.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/09v9ukneuv8g6ts6mamokd99gd/54864118411.pdf
    • http://3q1p.com/upload/file/210615152746884752l5rblxwt2sz8.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd606d564---39760719952.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9691c4fa1ac30fb94ceebb30321346da/giregutapuvupiker.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/64005959075.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/n8a0g290lg6fb3dmd5nk4vr27m/kalufogujumome.pdf
    • https://motelandratecuci.ro/userfiles/file/mozuxawogimizerifoteb.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/29c389c77580b16d73c2885e5147a309/sigetudepalena.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5a66c57766---kumifivorurubenigikelat.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbe3aa2a76---vuvikonomegumatilu.pdf
    • https://harrisitalia.it/uploads/file/38960395697.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/3103439089.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8032eed85---75043195065.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf04d66d15a---tusamugewapapa.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/guvibazazam.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ec087240---wabuw.pdf
    • https://atcotourismtravel.com/userfiles/file/21157228050.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d6.bin
c0170424a70acad2ae908f83d5bc0f366992fab800a4c5be58fd9db743515993		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 10588 bytes
font_01_sfnt_off0001111e.bin
c1ed3577223d11607413032d246fbdc50832a4317b2b79a0286b5ebff19ebbf7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 18060 bytes
font_02_sfnt_off000140b5.bin
0e3d63f173342003c62a86c726d4d5a85e7f52d44cf06618766a4fa08a0866bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x140B5 16088 bytes
font_03_sfnt_off000155e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155E8 16792 bytes

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