Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54806531071ddd9…

MALICIOUS

PDF

86.6 KB Created: 2021-06-11 02:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51062c7971fe5b81112a3b466e852fd3 SHA-1: 801f52a48ba73106ad29eca70c6989bbb8f99448 SHA-256: a54806531071ddd991beab72866173d2f75fd7044f59756ce0005ce8991c5f53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

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://crysiq.ru/uplcv?utm_term=5th+kalima+with+english+translation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5952d6c73---dawizenibuvor.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3fff5344c---65292639260.pdf
    • http://www.pattyn360.com/upload/forum/files/sisafuzudep.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/94e91b9c4e641a67d765dd120b492c08/mezitanurifopaloti.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c853b16272---24429785945.pdf
    • https://chp-travel.ir/data/file/19268669260.pdf
    • http://dharmapremipariwar.org/userfiles/file/31377985596.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/d48054a70b3c1685187ac3e40678cb3e/varoxadoj.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8e2081f6---luxizofokig.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5fffcd93c1e696aa6ffb64adcb5c1051/gujanizulexuritojune.pdf
    • http://brilspa.ro/userfiles/file/%5C/17903681008.pdf
    • http://naplesredeals.com/userfiles/files/65320997525.pdf
    • http://dekoblickfang.de/userfiles/file/70513099834.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f459d3b860---vujulovil.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a64a1eaf---43867943804.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a327271a17b---minuzedijefonav.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091637f76771---79634509595.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef4a2cf12d---jukikos.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/06fda4a187379c5d0a1c5c6e4a305f7b/28639103310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010806.bin
3bb3d17245eb34494ce8aa6508eb16a0d490172eb02a8ac8eedaeec83a559134
pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 5072 bytes
font_01_sfnt_off00011922.bin
ff49073629f06826bae45053586a6d4503c90926bc79724491a470c1c5d6b7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 11552 bytes
font_02_sfnt_off00013f07.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F07 4324 bytes