Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d2f56f8e2abce9…

MALICIOUS

PDF

84.0 KB Created: 2021-07-01 10:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aaa40ebb584c18f39357834c258e9933 SHA-1: f29fd029b57727a1e5bbf19b4a29d1806020963c SHA-256: a0d2f56f8e2abce98707a4df4caab1b128e57912d3aee5aac28a3c5405a29d39
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/67ddb7ec9841bc0492b913b0136ea8e9/69034759227.pdf
    • https://ceral.pl/ceral/pliki/file/1658663356.pdf
    • http://allprintusa.com/admin/images/file/98391487249.pdf
    • http://cableesmaltado.com/d/files/88651306969.pdf
    • http://ubest.ru/images/file/zenufabimulutafusomupi.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/iur6ljuvbsl2m3cruoikptth55/teviden.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f0ac4332---84327756899.pdf
    • https://ski-experience-japan.com/images/blog//file/29416157148.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/82pmfhcoa43kv6ndc0mk6jv4m1/31414533284.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6f1cf530029eeacb9900f45628328a46/mavotomivimevelu.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb732a5ba4---99411013985.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b7ab002e2f7b5cec218647b20e598523/bevabuwu.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/17ea465063b8756c269567ee7f3d6296/96278950792.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a682ee0d8f---bunajepovifegukujopelite.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+noise+does+a+peacock+make
    • 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_off0000e21f.bin
7c6141e8e813d6d2af68bb7963a940906fdbd72ab119fd20a247e2b522580666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 17880 bytes
font_01_sfnt_off00011130.bin
e8b9739d52dea001ad4316dd82bc6d143dc89a92da2054aec9c182233fc7b09b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 10720 bytes
font_02_sfnt_off000129aa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 16792 bytes

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