Malicious PDF — malware analysis report

Static analysis result for SHA-256 b60cc6919885564c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 14:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 743d1c2814f53d950656f25830ef7acb SHA-1: 92c3f67bda454bc2d49452bfe624d60dfd667081 SHA-256: b60cc6919885564c9ee8e5cfb250092af33140fe8247fae8ef1fa29cf871c878
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to external sites. Several URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=catalogue+facom+f18+pdf PDF link annotation
    • http://nensi.si/upload/file/funeko.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/28575226232.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607be3510fa85---jezejupasixonenosekimofa.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/47282538159.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/16695077651.pdfIn PDF document text
    • http://4darchitecture.org/img/all/lasudikajogisobakukireto.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c325eee34b---45241882066.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/7872971755.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/pitami.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a26b700e557226ea2032837264ee8342/memegegisaxowenuwuse.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021063001002061.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a8b3af4c9---33739040270.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/limajeferafowo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b040dbde2ec---lexemamogolusoreti.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/97032334948.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/49a1702b7fc1895d8a3da506261b473c/26410331423.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/nuvusuvikedil.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2b32c1b3---juwixezuviwunaposoxuwiba.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/91787244623.pdfIn PDF document text
    • http://flirdining.com/uploads/files/taviwusunujebewukejo.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/55307366498.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/5cc640708d0f79fd0281e8a88854a7f8/sadoxoleragemegepipili.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_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 18796 bytes
SHA-256: 6268d52f20c199c9c67066d86dcb87ac52f2cc08f704de275576b5b392f290fe
font_01_sfnt_off0000f72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 10888 bytes
SHA-256: b37a0e16166d9b604da56162b79cd8767541549933fd5d655620d3ea6b89b5d9

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