Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8965c4703bce59…

MALICIOUS

PDF

110.6 KB Created: 2021-06-30 14:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 04ce1ac21d3897b2f355454f89d9361e SHA-1: 0aeff91791998726a572790f2f873c707841f53c SHA-256: 0a8965c4703bce59e228cf5e5e0b3c252c0f48b02496fdca0f78c9456ee6bf06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to compromised websites, which is a common tactic for phishing or malware delivery. The presence of multiple external URIs and a PDF link farm heuristic further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f5c1735d3642466e9538286c85da8d71/88421487242.pdf In PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/17666d438ec55507805425efbf34d7b8/tezadotemafilarawopoba.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/e5b1cc5c6d80b5d266ae5aad7ddd81cc/kemejufegesesosijefituto.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23919a0674---nijubebonozukazat.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/e2898fdd93969d6ac9560cd36bdfeb0d/88151499542.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/8220690100.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c739beb50b1537d41ae819956cd14489/10641447203.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/zometabalobuzer.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/sezegabifi.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fa0e35014---nezibexaranafizixomonujuw.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/av6rsg2ak52jr3k1n2848apdq6/mamabovizisipa.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c27f556402---niwerujapozisu.pdfIn PDF document text
    • https://andrejc.si/files/file/vamapek.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/983936f806ce48a466a29b99dd89281a/16929883929.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350a708845---regitosaxotir.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a709d6a9d---20120294361.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1seogl8ic215ar0c4fcji75ea0/jaramotigirobinom.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r2t7sqfap76s59mdh1k6nlof20/vileloso.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87c8163ff---91499680009.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1cd5bd98b21ff90ef2b75045d33174bf/nebovewa.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/bb7e287a6531dc09627ac5fd91e105cc/pewujefukin.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9tjniah3vat1tro32vu3cbs3j1/mugesavi.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6a5bd105b---zugekek.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609602b5f31b4---fejotowalarasixudojuxijid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=facilitate+continuous+improvement+assignment+answersPDF link annotation
    • 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_off00014b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16331 10944 bytes
SHA-256: a7e198547ee6df55bcffe48c5b928ff6a538a933903fde44abde2e41096d34b5
font_02_sfnt_off00017c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C93 17820 bytes
SHA-256: 6e7efcaceb0686329eb389127ecbfea0b570632c52bb51c9c3cd7ab89a732e4c

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