Malicious PDF — malware analysis report

Static analysis result for SHA-256 34189c45586bd1cb…

MALICIOUS

PDF

87.1 KB Created: 2021-07-29 13:12:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d7cd5f1e1e4593d0f6eb4f57235ac56a SHA-1: b1ce689b0cccb96f9acb144ad7fdc3abcad14cee SHA-256: 34189c45586bd1cb3b244c1afca7ba6bc580d2463dc32e9ef876eeca5a44f9b9
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document body being unreadable due to truncation and encoding issues. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c52b4a0c2---jewuloberefejekukijune.pdf In PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/38788525617.pdfPDF link annotation
    • http://sanruou.com/app/webroot/uploads/files/duravokexupanil.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/4df69c1c3971cc992f02652b52a9cfe1/jujowuzasobenumoxesomane.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e1b74e9399cb05485f1e6c45f1645da/99353347230.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/64401426490.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/55b0e4096ff65fddf64ae83167b527ae/tomexuniposesitafanonu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607473209ccf3---vomototitibumosetaxemi.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080d15468b71---10092739537.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/75688598040.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/9jqa473m1ke7ti9trutvgfel2i/tozakuvolikejudamumi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/335914ae65a659fb3299e8a64aee2a35/25352772851.pdfIn PDF document text
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/12093801597.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ngnvfjm81u35d9n620vm67o3rf/gerisida.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/19688008080.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a5db1f5a---tofulolop.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/xifipurenakaz.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/kefupuzoxuxafapegi.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/vesin.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e0df433a2843d800d3cd1e50f6ef87bd/zolotubakorife.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/mr165eaor3d6a9oicmjktrch5et23rsr/potorenonefu.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vugoxividalesug.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/32220151449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+write+a+resignation+letter+due+to+personal+reasonsPDF 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_off0000f0e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 10744 bytes
SHA-256: 426576631ed8a0ff4fe08693f4743c2e7f4639cc33a0b8d5be9a502fc70f3486
font_01_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 16928 bytes
SHA-256: fc3a67a3ffb66831d79bb35adfa47f7f6aaedcd85ee808f0efe2883f6dbb5bd9

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