Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dfe666940953bfe…

MALICIOUS

PDF

73.3 KB Created: 2021-06-28 08:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: cb5d35c51cf13833ffc345fa0136809a SHA-1: 99bdfb8b0f91c09b036c654d3be6f878dcc85192 SHA-256: 7dfe666940953bfe1b3da922b4cfed2727b622a7398c31da240200c18ab05662
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing attempt to lure users to download malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics, along with a high ML score and ClamAV detection, strongly indicates malicious intent. The document body is unreadable, but the heuristics and URLs point to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aawyx.com/sites/default/imageuser/file/joregajepoximerewexozasi.pdf In PDF document text
    • https://bodegoncriollo.com/userfiles/file/fedadomoxopal.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/752d933cae128dcb1b397724981b943f/sewurujeranim.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/e2a34e9751c2b8f3c7ae9aca358711f4/patuwivagopuvuxujazodol.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4878466e31---66968315198.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/96152134640.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/43207893849.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/vokudepenozusotagek.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/632447dae407fd2aea9716944ea3849a/23978000635.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/xawomikiverewivewir.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805825540f1---24835237920.pdfPDF link annotation
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d631d0ceb01---8968422327.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/6ffd86154f2c974332a301fc19b00138/60574130378.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/rogezu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb48ba7967b---kodilekumanepewiv.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/povupobon.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16087930691d65---75841060077.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ekd8oe4a892j1vom9p19rq3cc6/20701516999.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467bdcef99---16773073913.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7b38a522b806e7af345f86948e8f8884/kajexix.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfea1e60d7---vitisuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=cot+135+degreesPDF link annotation
    • 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_off0000be19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE19 10408 bytes
SHA-256: b6b3a8221d06d472a63f4b3179d542fdb291f0871bc0ba5d8da4df4deded0c64
font_01_sfnt_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 16604 bytes
SHA-256: abe4381a7a5e5cbecd0cf238b5005651a781b01b366f8f0d0e6e00ecf2073f21

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