Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e57521a826c3fa…

MALICIOUS

PDF

96.9 KB Created: 2021-07-01 13:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e70d822ea75eab723ffa3f9e6e9f587 SHA-1: 642dfcb8a465470cfb57fa7c23334c0ed2cfa899 SHA-256: f7e57521a826c3fa2d1319243babd799e751b08707c1de619f71d60d43c688fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or redirect users to phishing pages. The presence of multiple distinct hosts and disposable hosting indicates an effort to obscure the true origin and purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/36de9903a529005fc82c0933938a7d47/manunigabewuro.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0d197f2a40c85482af219ffb6390625d/lowedoguxazepesogariwapaj.pdf
    • http://cuacuongiare.vn/upload/files/derepuvamur.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cf11d0513aeb713a7bcd833d72fc9bea/vubigejipul.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab918cc45cb---51735844713.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b95564518---vategegidopemawe.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dec0bb231b---19777245134.pdf
    • http://akcjonariusz.com/UserFiles/file/jewilenoferasagenoni.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07d1f2c9de9239768243df6a1ee1900e/sujitu.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57b47d8e51---11534016720.pdf
    • https://buka.ru/sadm_files/nuvamunogovebigiduri.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/01ffc2682ce80b6fc00fb7f4b9fdf316/21625157958.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/44fdfd0068e62fbe3934847f222e76e0/39377688761.pdf
    • http://brmxn.com/userfiles/file/20210521225157_g7mkxl.pdf
    • http://trevelsi.ru/ckfinder/userfiles/files/12846077135.pdf
    • https://pui-vital.ro/msg_media/file/bijibunedapobipuvadugobo.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7fdacc1cf---33706755882.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/huh97pomoen4k05hbbqp6gqlv2/rupokerila.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ea6b06314d07d1ffe584ef0d691d9361/betibasajanimipisiji.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d3c209a8eb362fdac5d90ffa050be38b/69400562297.pdf
    • https://soudurelausiere.ca/upload/editor/file/rojatenez.pdf
    • http://palami.by/images/file/49391096445.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/fb83c9dcb0452265448564f98c36f6fd/41577774364.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=prayers+for+the+fourth+watch
    • 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_off00011811.bin
c36eb3f11295d63a45650c11521713020627c89bb95580641aca7e564464b7b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 10492 bytes
font_01_sfnt_off00013036.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13036 16792 bytes
font_02_sfnt_off00014848.bin
d3076c49e207e45a7d74abbb5cdea4362a8ce33f91f30b9aced20a146063fbd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x14848 17012 bytes