Malicious PDF — malware analysis report

Static analysis result for SHA-256 701fdf780c77c111…

MALICIOUS

PDF

84.5 KB Created: 2021-07-17 10:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 68bf4e1cddcae26648c181e5d7abce21 SHA-1: 3fba43b398d849904a3fd54d3925222274faba0c SHA-256: 701fdf780c77c11143664012d9514e8e4ef7dee73bf107bde4527466afcc7cb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to various websites, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the heuristic firings point to the document's primary function being a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607d00f1da44d---zafukajejagokifed.pdf In PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/janofomiroxofog.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/o2ggjt05u1e309d3jdfii2atef/debagiwixarer.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/jazaluxukilefikexeniruvi.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210716_ECF86C2522AA2905.pdfIn PDF document text
    • http://alkanboya.com/files/file///nojakolumawetofedatik.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6304d777f---saxavepukaroxegenojelaf.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/34463762659.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a452c733aec---44848621104.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/wobijudizewazexutipi.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/sarefufawi.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/sasigise.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/gadeselogobiwajenatejudut.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/53170460379.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/vonig.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f08a227d40---40659183134.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/panade.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c298ad9a22f---8433397014.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a96188c875e---jusolefonenopekeparusim.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sufemonifoxav.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/en4sljr9uguv03npkua7lko1sa/58545179771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=horror+house+imagesPDF 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://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_off0000ed8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 17660 bytes
SHA-256: 1b802e07b7c3487cc91b0830c588d9f68fea8cabfd4d846ac8a31d825b459968
font_01_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13366 10396 bytes
SHA-256: 2d0e3d4afa5e72740c55cf3e9207a25630dc3c6e515726968593ea776bc75b5d