Malicious PDF — malware analysis report

Static analysis result for SHA-256 168660c7e192d40b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 20:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 731eed7db29b58e8f7633a8bfee2d1ad SHA-1: 2ef32bf11e4168eb56f786bd16814bc22b3b8e05 SHA-256: 168660c7e192d40bc4c2ba9cb68462e85acd4e88c20abc5e28de6631c34db7de
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics suggests a deliberate effort to create a network of redirecting URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crewmak.ru/uplcv?utm_term=film+maker+without+watermark+apk+download PDF link annotation
    • https://omprintandpack.com/userfiles/file/xupeboxirogidejux.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/viwosobukubofusiwuw.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc4bcb81dfc70e73076b330589729fad/majuvorixurozowege.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/022b785b312fbb2018e3c2622279bb70/80854462468.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f4e2b050---79085228872.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/sibiz.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/82849611943.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/81524570300.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef441cbf43---54870217719.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/39647337303.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/lubuxalipiverunonovefum.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/62750984492.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/43037159689.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e65b242d---88700166053.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/25149574084.pdfIn PDF document text
    • http://wohingltd.com/userfiles/33499550517.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/kimakixaxolidite.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/nijogu.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/vovagopawarenexojima.pdfIn PDF document text
    • http://atya.eu/files/file/93015083636.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/dupurixemisavopudod.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/97460087723.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16130168abf60d---90748308091.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 10744 bytes
SHA-256: de978708c85338c5a0faec12627a1d1e7dccec04b5f8c691b021257b2785b2d9
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 17988 bytes
SHA-256: e59320b7985924ff6c4deeb48bf7268c3cce2b8cc2aa797bc72c6594c4d6071d
font_02_sfnt_off000128b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1