Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05094b4295a8ee1…

MALICIOUS

PDF

100.3 KB Created: 2021-08-08 17:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12f08bf0fe6e91da990a6ff2b3e70165 SHA-1: 8ad6f96e507dda2139917081bb0701a7ade54719 SHA-256: d05094b4295a8ee1cd948f80e447a7599da2abd495aea0748a934d682abf0f62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. Heuristics indicate the presence of a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The embedded JavaScript likely redirects the user to one of the identified malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tragadsonisurat.com/ckfinder/userfiles/files/womozepisipilaz.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610655637989c---23874994394.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/vibilunopa.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/36d51959ce25ec623ff38fa13b0bd917/62776279579.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-29/20210429065633936786.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc5c3a6219---49701712663.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baeba655b8c---89539812416.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc54d6350c3---butowojinajibeniziwi.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/15370469363.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/67455873174.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/nalitiwebesulina.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080490a4da1b---xusivowomuziwekam.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1570e9936---fapuxakodunazul.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080000346a9f---limilaxisidulejiwara.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/94523126375.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/xipafak.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a10647dd7aba93b6bf0aa7abb26e51dc/xafiwumakeveluve.pdfIn PDF document text
    • http://suacuacuonthanhhoa.com/upload/files/52768268801.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3eed0552---36107772913.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/24929004559.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160804be250451---28618316145.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/xowoledarizagijit.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/26714244408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=arabic+grammar+rules+in+urdu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f9f4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF9F4 21748 bytes
SHA-256: 17bfc154c2e588e27f75e3f3c702e732410b0b288740428bde5ad4982f40660c
font_01_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 10968 bytes
SHA-256: b99d1a3c79b97dfc2d503386ba0ec866e6089d211f637083085667d6c4fc32f2
font_02_sfnt_off00013978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13978 18644 bytes
SHA-256: 485fd1726d01239cda64e0b26205c2c828d7b5eb2f2e77ad7ecacaaadfad5416
font_03_sfnt_off00016aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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