Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b224c1aef89a84…

MALICIOUS

PDF

82.2 KB Created: 2021-08-18 20:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f4983c770ab1c681907ab660cc4f6a48 SHA-1: 497f100936e2f64b44e1aa48faf8d1bf8dfc25d9 SHA-256: a9b224c1aef89a8443f0a08e04b4822761476be0d2be58d56cebbc1258e9c9d0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081479f2bb7d---14473270033.pdf In PDF document text
    • https://arch.ua/ckfinder/userfiles/files/18208540897.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/95322440643.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/143ac85fc1546bc0799fc6b609514996/sinaroduxenapamomonomez.pdfIn PDF document text
    • http://absigorta.come/file/najadabosofiniweg.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab932524b8---suborilimurivuful.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160900acdde175---pedubakabifofevemam.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c31a78f0b84.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dtn8r1u3a0k39kcmfmrgbam646/53088658290.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/8631656128.pdfIn PDF document text
    • https://netpage.info/userfiles/file/naredokejevaxi.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/58573811190.pdfIn PDF document text
    • https://soechi.net/userfiles/file/tirezapifuwegefetota.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/45307900141.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/raxosu.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e6423d169---bemisexazebapusowalobuta.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/wasibekepevog.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/99b65271c7eb1a3cc42f9fc18fed4d96/gazajuwapufenavanatexu.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/wusurox.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/8562302631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+calculate+current+carrying+capacity+of+a+cablePDF 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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 10916 bytes
SHA-256: d29b32dccf02ce8e628295aff5a64c02c108c872ede5d04565fa345bbfdeb521
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 17644 bytes
SHA-256: 91e87ee84d02ee8001dba49db279dd4a15b377ce1b0d446beb96b90cd7cd3a05
font_02_sfnt_off000120ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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