Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0d01bd29eafb42…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 08:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e07e78e3c24736281320d2948999f11b SHA-1: 70cc319180ba9c99922039bc354295a59b3da9e0 SHA-256: 3b0d01bd29eafb42b4c942b773ece4b3b2008a44f6e3b008a36a0a6d8790a9ba
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, many of which appear to be WordPress installations hosting malicious PDFs. The presence of numerous distinct hosts and the use of 'formcraft' plugin paths suggest a coordinated effort to distribute malware through these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d20d764e0---remokoboku.pdf In PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3932dad8---21873200553.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/3508257597.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef6c94762a---juwewumetusizifagude.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d8cc24fcc---jasuriz.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/82269726331.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/18861093638.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/28250583415.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/65830650959.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/96775887346.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/a23a809749c129528cd80809552c9b94/68860610145.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/26271421697.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/xotilokosozanom.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d44e539efd197dff4b75390124917b4f/jogefi.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea304de01c---wotomezadimo.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/62385553719.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d9219f2d3---13556471750.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2e80636d---woxorimovajavosunes.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e354e1695ac---gofed.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jmg67g5p60pb0q0fr8q47isi06/tazolibasidumefedasizapob.pdfIn PDF document text
    • http://builderall.info/userfiles/file/29676572265.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78906147e---72238395275.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/92e4a7d54c80414159a5df46ff50304c/jixobarotexigakowalagamex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=4187+separate+rations+examplePDF 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_off0000c596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC596 16000 bytes
SHA-256: fc2672bb676c7d94aaacd7425cacb800bbd2dc32f7475107682706e9c94402a0
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CD 10808 bytes
SHA-256: 56bbfbd52617d2672a849cbeba2f2144e9e5c77f6241a69e418c195a0c53c85e

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