Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f168bd644e9c58e…

MALICIOUS

PDF

87.5 KB Created: 2021-07-13 21:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23bb7fe6219b657cad33af242e8062b6 SHA-1: bf98e0f045449d3afd9d988f75fb3519775402fc SHA-256: 8f168bd644e9c58e6d35b2b3001ff30a11563980eda8c72dd5490b012765f617
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f8c7ad83---bodegolesuwudavosuka.pdf
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210531175404.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c151b5a504---66202511691.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c9d86ac73b4a5f0fe309282bb5ea01b0/81360259536.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e8954d8e---79211819524.pdf
    • https://lexcyberia.com/userfiles/files/75163369605.pdf
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a526eec77db---5393115760.pdf
    • https://bushregenerators.net/userfiles/files/4320330682.pdf
    • http://ourhkg.com/UPFILE/userfiles/files/mebad.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ece4d779---vaxiburimukaz.pdf
    • https://premium-house.uz/images/file/74307812464.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b28848ca3---benemelijut.pdf
    • http://studiotecnicomartani.eu/userfiles/files/19295508274.pdf
    • http://kukubara.com/zdjecia/file/37475731056.pdf
    • https://fivetc.vn/uploads/files/87916521948.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa2795603---bujepufexabox.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520103134179707.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/05422a0d2b2d5af4a3986a6545dbf4ce/liban.pdf
    • http://fouladsazanco.com/Upload/file/nekomibonudina.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b079cf62fe8---sufobedu.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0283a75ec---80956401652.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb82273f48---56791403968.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a1cd3744fe9977194b409ec7fb49d0cc/58465042422.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/60b6ee3fef9bda932c269d3ccfecfbf6/zarazap.pdf
    • http://kibbkw.com/uploads/file/27766342275.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469f0dec96---lixudafowamujosofoziwuxu.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d298e1c4182---rupamatesetenaviburevuni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gate+and+pgecet+for+computer+science+and+information+technology+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_off0000f011.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 16792 bytes
font_01_sfnt_off00010828.bin
0f01bee8de38567eb02b05fa39f4bdcce9bcddae81d4c1bfbc52eec3a2803a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 11320 bytes
font_02_sfnt_off00012268.bin
e321a9f027cd5f49bd14db42dbea52af87cf467fa01dcab28502861ed064620d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12268 16752 bytes

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