Malicious PDF — malware analysis report

Static analysis result for SHA-256 25896ab9a1c9bfa4…

MALICIOUS

PDF

94.2 KB Created: 2021-06-20 12:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d3ecf1445bf03880a0fc24959d035ed0 SHA-1: 42d7445bbd6731384eb9f8d8fefb9401e8f44c24 SHA-256: 25896ab9a1c9bfa4f1ede30ffa934531ac2a3ebbcbc38e706450afb1bfdd2d9c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, embedding numerous URLs that point to compromised CMS upload directories and disposable hosting. These links are likely used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/aabf96f7115721581b963d223f4e63b1/zumagozotexenipil.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b93a0320605---35519955629.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608101b219971---notub.pdfIn PDF document text
    • http://nakatka.com/files/file/74892232540.pdfIn PDF document text
    • https://strechybenesov.cz/content/4898868927.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d2853348e---mebadesekakolekereven.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/a2ad6c99735a0d5a7e5bb81c50858d46/71038563760.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074939682ca2---89189506305.pdfIn PDF document text
    • http://nfc.soo.jp/file/98412959398.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e09e6b052---kaxizaraferize.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ad14bea35---tinitijilajewivagema.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc2f30eb3---39525687964.pdfIn PDF document text
    • http://emeat.ru/var/files/pexogosidivexularux.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/c46324141db102fbc21c0eb31871abb0/zugodilav.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/65braem7ro56kq218vossgcl3a/42791958005.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160740ccec5919---8562108274.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/ngfLrbzwjls/uplcv?utm_term=play+pokemon+diamond+on+iphonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001106a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106A 5104 bytes
SHA-256: 9d3732be671157d07e85641bf06aa6a01450396c79d3edc1d8c69afc0dc366ee
font_01_sfnt_off00012223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 4800 bytes
SHA-256: 6f4865b5d7bd2fdfffed2c77f259cd896987192dc973b636f1625a7ee08ddd54
font_02_sfnt_off0001323d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323D 12616 bytes
SHA-256: caa684d637e4c9d1e655707b9c09b3ea1b5c6dcd9a2453cba0ec2302d508e0d2
font_03_sfnt_off00015b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B93 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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