Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8dfd6df8494cd43…

MALICIOUS

PDF

76.0 KB Created: 2021-09-16 04:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e1b8d9216857cddaa1f03ba145e333d SHA-1: c32ad25a8c394f228b01f72d2886606ef2412687 SHA-256: f8dfd6df8494cd4310249d22dc6e69130e1dede0b276d2fb214ecb2e251457f3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

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://panelshock.com/userfiles/file/wofavetakiwubimabi.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/14358819301.pdf
    • https://papiratisk.cz/soubory/1262064873.pdf
    • http://tnmetalworks.com/images/files/jopewo.pdf
    • http://kerekagy.hu/UserFiles/file/8186709899.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b49f791591---tevipezaxorolegu.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8fb9041c3---28831646578.pdf
    • https://lrsdev.com/userfiles/file/xasofubiwabijinizakisatix.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656d860528---pakofajekopubilowetu.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/waven.pdf
    • http://suriyedostlukdernegi.org/image/files/fuxubefisejigisunel.pdf
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/1605489418.pdf
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/85546375985.pdf
    • https://papiratisk.cz/soubory/xedas.pdf
    • http://kowel.com/ckfinder/userfiles/files/1631702732.pdf
    • https://valleyrentals.com/userfiles/file/67264387568.pdf
    • http://mamitobe.ru/files/file/60256296042.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1fcf40951---natatabodorulepixoderede.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1e531218---20605615232.pdf
    • http://sungder.com/upload/nulogalosakulujusizo.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/33917700150.pdf
    • http://iamsong.vn/uploads/files/kakefemopipamig.pdf
    • https://doublehaircenter.com/upload/ckfinder/files/mexupaleseguluzab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=brick+breaker+glow+balls+mod+apk
    • 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_off0000bb2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2A 16792 bytes
font_01_sfnt_off0000d33c.bin
26143cdd44c17821e714d0bfb9f42acb1ed5b9d138c408b9194d3efd3eff7bbe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD33C 20400 bytes
font_02_sfnt_off0001090d.bin
f13582efcb05ed10dfca34787c6dc3443d61a1a9e04e9415d4e3d83b16e20e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 11028 bytes