Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a4481663e08d728…

MALICIOUS

PDF

75.7 KB Created: 2021-09-07 20:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2493b8581e98108eb4eefd96ef86d5ef SHA-1: c6b1ed9db684507782be6b23528df370bfd56cf3 SHA-256: 7a4481663e08d7280cece468d8f2cc229c419e3c64d762fd736d69f859032564
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/21983863076.pdf In PDF document text
    • https://khabul.mn/mmpa/userfiles/files/jidubimuluw.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/es31lb7gfnl835b8b18be68m16/fepaxezu.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/90886085603.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4626b29ff77d45804f36787458807aa0/toniwabafet.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/26031078885.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/58838445345.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9d04002718168c6bbc8710dc5665e1a7/33948957440.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/5380350793.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/degerow.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/66446067144.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/godiwukunom.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/hup8khd0009ptfnoahkm2qqs10/diwadotugav.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/72f602e4b16fb18e16099dbdba714b88/28056727623.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/50931998946.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/80547668775.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6qvrfia2e4fi6shita74tleum0/nekemasisesifofe.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/fevufoketakavuza.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/63764661480.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973c1580a79---redenudosaruvubo.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/11493a1c714011a67addf8953e93dd9e/14078508635.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/61860552546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=its+vs+it%27s+worksheet+pdfPDF 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_off0000c169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97B 18376 bytes
SHA-256: f7ed245fc482527fba3179c5c0a543d13cdc5a1faeda054c7414e840f3c0b93f
font_02_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 10512 bytes
SHA-256: a277fbd26960276035fe74a4550e6ee6022e0b9064fdb6faff5f8db323a8e449

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