Malicious PDF — malware analysis report

Static analysis result for SHA-256 439ac1bd2a94cd7f…

MALICIOUS

PDF

81.3 KB Created: 2021-08-29 01:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7ea133763ad74e4b6a67d1b9071a313b SHA-1: 0d23c798259eeaf40aa3fa6612ed148150422cec SHA-256: 439ac1bd2a94cd7fcb0e755c6e2a9f13be96873a82671311d4635a8bd158552c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of external URIs pointing to potentially compromised websites. The presence of multiple links on disposable hosting and compromised CMS upload storage suggests an attempt to obscure the final malicious destination. While no scripts were directly extracted, the PDF structure and heuristic firings strongly indicate a malicious intent to redirect users to harmful 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://pixomot.ru/uplcv?utm_term=meaning+of+strictly+prohibited PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/04f133fcf751efe788f370c5984aa389/wizitugowafomumukerod.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/kaxawedokodaxutorata.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/45f49d1c764137eac43757b85bc774e3/wogaxeta.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c561712254---20854778943.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/76179052371.pdfIn PDF document text
    • http://ashioke.com/images/library/File/1420910780.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/sunuzoduxitok.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c330a151a2d---50203085120.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/mikon.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b72f478c490513b665539ab4d2ccd293/pupasugamax.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4f57c29a---14152361640.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/90276873230.pdfIn PDF document text
    • http://azinsaghf.com/cache/fck_files/file/rirunimodazonag.pdfIn PDF document text
    • http://dahchen.tw/userfiles/files/47161508083.pdfIn PDF document text
    • http://hanshintech.net/data/file/diletikixaf.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/54826220892.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/33687208356.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/58819837015.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/44241453426.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607640aa16377---62547347208.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609695e8df437---91880506109.pdfIn PDF document text
    • 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_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 11148 bytes
SHA-256: 58fe927c930b077b6e1def08d562fd587b6895671a34a09c7a27fd969e9403b1
font_01_sfnt_off0000e87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 21092 bytes
SHA-256: c3e06e334c358d7b49f1697b303d60740623e39a28ff20108ef9791f87f05a4a

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