Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d425786a80fe9b3…

MALICIOUS

PDF

64.7 KB Created: 2021-06-18 09:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 704ee2738edc794a66249be2e40a0632 SHA-1: eadf78196b160473447dac74f28873373b8589b3 SHA-256: 8d425786a80fe9b32fbc8e8ab543518577547f5ffeeae9a8239494c5baf94fe4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting. The document body contains a lure for 'Free very old granny pics', suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kpt9ffarc3bhqh409rfvdod2bs/rekijuzigalufediwifesa.pdf In PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jm7sd2kl695e2no7dol4vtshjf/7819954921.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf8ad20ab9---xazopu.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/xoputetemevux.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9b842f85---56782775749.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d40d1870d8a230387826c10374d82cc0/96156182643.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/felusuj.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/ed3c289e95beb241d4a9690d9ea8ab67/39804391285.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/vivegexutorivudojiva.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/92018258030.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/bevufetepodavusewivu.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fcb02766e4798701ad98f1ad766e4981/78091220987.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607656c5607da---91636479614.pdfIn PDF document text
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/57114372563.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/buzagetitu.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/nolefedetifodoten.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tigimijovogadebiwek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=free+very+old+granny+picsPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46D 5064 bytes
SHA-256: b9cad8dd4b6bc656e4f8dd2217b1d261fcf5f0afc419648d9ddb6d5cb29dd7db
font_01_sfnt_off0000c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 10068 bytes
SHA-256: a5e1b26e6669942ea0885d62b061bf497abfa5653d1e21aba99cfd9a77bc9078
font_02_sfnt_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e