Malicious PDF — malware analysis report

Static analysis result for SHA-256 933a6ee10ad5ab5a…

MALICIOUS

PDF

88.3 KB Created: 2021-06-26 07:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4cd9e8aae2d0aeccde77bb14ff881f4 SHA-1: 02752c9314eb16614d0c4cc1c88943db0d7b3ac5 SHA-256: 933a6ee10ad5ab5a817707efa4a1b45ee5a5bb7ed88cbb4862955571471b8faa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable due to encoding, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://garglob.ru/uplcv?utm_term=college+mathematics+for+business+economics+life+sciences+and+social+sciences+14th+edition+pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608067f2a784e---41452440199.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/k1q6sasib530dtl2opmes08ha9/26563634486.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4415cbd8e---pixojugulawoxapefe.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d356c93e---limuxalubolobu.pdf
    • https://asset-books.com/userfiles/file/wovapogi.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5275bd58fba29b4caeb349284f4db540/buzikosuruwexebilaro.pdf
    • http://kalikraft.com/images/file/gikokanakisaludogi.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d8d6d5839---fapusaf.pdf
    • http://pokemom2.com/uploads/files/mujosotekew.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/73b5a76854d63b6d0b45b8fb38f1d931/jewulotisojujak.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a4092f43f04b989fb62566ba712fce4a/71511420509.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a30399f1118---89424501324.pdf
    • http://tamker.hu/userfiles/file/37110759881.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b513ecd1---71596991926.pdf
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/93405311882.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/dewiwuxepunogilo.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/97a4a9662655a82ce25f5b58e5e450f2/remajamogusobi.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/48585629073.pdf
    • http://gphs84.com/clients/866382/File/mekifalelutox.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb7284df1---55191969910.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd0c65537---4518550659.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/0hsfglhrc7aqvkupjq11gd8a00/derokujujilowaxuruga.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/7bd4ea576e53a9142de7cfd572634443/43789203890.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094ff9d5f4d0---fikaziripamaxowazibaji.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/eca79888ac771a0747b1f5bdefa9368b/kebovurowebefofomajagox.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160728e801b576---61759677633.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/65051234842.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_off0000f34f.bin
5b67162ec824444d32bcdabfe4c974900ba2b88efb8a77e1dfc6766548a7404d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 17096 bytes
font_01_sfnt_off00011faa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
font_02_sfnt_off000137c1.bin
aaf0ccb8b03d2e388fb9e5613dd2334090173d45c2f072aa513293332d0baba0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137C1 11468 bytes

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