Malicious PDF — malware analysis report

Static analysis result for SHA-256 878065ea489ba719…

MALICIOUS

PDF

89.1 KB Created: 2021-08-21 09:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 3652440579b46c8ff7a45873ad7f16d2 SHA-1: c1b15e6a5a0046f1e7c5f6b94dababbfb8c9637e SHA-256: 878065ea489ba71991582bf7b200acd9be306d3b9521ee3aad12d2ca2616dca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, including WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=download+tubemate+youtube+downloader+beta+3.0+apk PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0grv1bf7ppd1bmoahbvh590i7f/43621021848.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7956e57d1e---40271080304.pdfIn PDF document text
    • https://anduong-nhatthanh.com/uploads/news_file/88361945232.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210609_D521F97C7688AE5C.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/50920849923.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/95aa91bf4244819525945005b64a67f7/koxojibanipabeza.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/1fd93d83839226533d0f6e02ff898a61/44906721516.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/66843813908.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b999f6bcdb4---53692929300.pdfIn PDF document text
    • http://oasishs.com/uploads/files/20210708_061459.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/xonot.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5528f34970d0435759396b6de82d1671/18314421571.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ujtae44fd1t0c59d0invvi4vf4/64367758562.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/607c1ccb311190936a831ece475ebf47/potoz.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5f1b2e265---lavivuwovofe.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/4570530708.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16238514050972.pdfIn PDF document text
    • http://mobilenmr.com/files/files/59200532635.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/rikix.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/e5a7503090c2d6b2fba04483fbb9c248/zamituteva.pdfIn PDF document text
    • http://theponghop.com/upload/files/katoladebidowu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e790d907c---94363719787.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 11184 bytes
SHA-256: 5c578569257316a557ddaf7a1d39ae944b380706af53357a368259c418b688af
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16968 bytes
SHA-256: 03cced7ccd5a61ee93c9427d6139408405be3928cc60598d4209294f4447de02
font_03_sfnt_off00013f7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7F 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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