Malicious PDF — malware analysis report

Static analysis result for SHA-256 376f1037e9e6a5a4…

MALICIOUS

PDF

85.3 KB Created: 2021-07-20 06:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 818b2f94e748daec951c6f3945983333 SHA-1: 66cb9aae500df8550da9a0eda06a0f32e786a1c1 SHA-256: 376f1037e9e6a5a410a9773da97629e054b8e275e4a71691181de63c56050313
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://people11people.gr/uploads/File/zureriv.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/026195be0ee4d61fd3b505744895ec6c/33977335814.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16086822a6564b---nezinul.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f625f99f58cde896581c6f1a03af5c6f/mitutusufutivogur.pdf
    • http://netinflux.net/userfiles/file/xalob.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/47d89fce952a777494843b78957655b1/77352899165.pdf
    • https://mimpishio1.com/contents//files/tegefuritidobivodopuwepu.pdf
    • https://tramhuonghanoi.vn/upload/files/jufamisadanoxalap.pdf
    • http://beiwendq.com//data/attachment/file/talan.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b06ee3714---pezujikokedaxap.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ropelezudoderumugul.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085c978d761a---sofifadafizowuwevelina.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb887fb13---54209802589.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/kijavomej.pdf
    • https://aquatrustfina.com/userfiles/file/rokokoxe.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e19712e14d708a9d3b1eb0294c7db9ca/bekatijasokati.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d52ad48b83b---gedekafuvigaxo.pdf
    • http://allg-gyn.ch/userfiles/file/70181800883.pdf
    • https://cowichanmusicfestival.com/userfiles/file/33473168636.pdf
    • https://likeevent.it/writable/public/userfiles/file/63459147337.pdf
    • https://rybczewice.pl/userfiles/file/tojuluze.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868bb9319c6---17096535878.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=closest+comet+to+earth
    • 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_off0000eb65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB65 16792 bytes
font_01_sfnt_off00010377.bin
47f8b3fae647dab38fe9ef0dafe46932f110204f1ffbd82b0a66c5893159576a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 17600 bytes
font_02_sfnt_off00013120.bin
0d3ae649ec212e480db70817f1ecedec2cc40b4723ac9954c28acadc3aef963d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 10328 bytes