Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2d8fc774799fef…

MALICIOUS

PDF

80.9 KB Created: 2021-09-08 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a1a2f0bab495aaf95a83fc4bd2f4442 SHA-1: 61b33fcf48ce0b848c96cd299600b7e0157eacbc SHA-256: fb2d8fc774799fefc9b14664e85378de651a3778e3a8fb2cd1cd73985b542618
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://zechnerbau.at/images/content/files/94255628908.pdf In PDF document text
    • http://th-hl.com///upload/files/lekederapowutokigopa.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/wakizawefolilewiduteter.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/4cvrrfj5bchob5tvc4n9f46h73/xagufiwikifupomid.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/kojipakugone.pdfIn PDF document text
    • https://tigapilar.com/upload/files/58583125581.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/30149799707.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/47790195956.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/75258785080.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nutid.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/41815489269.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/42312901888.pdfIn PDF document text
    • http://ave-france.com/pics/files/80808320018.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/silop.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40863701853.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/78305632751.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/detojuwitemururogamazuxaz.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2uhlmbsl35ektcsj41lbgmfs43/49496240543.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/99364593321.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f85494115---xifarusetetubiw.pdfIn PDF document text
    • https://mimpidia.com/contents/files/44676394559.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zidufuwetusudiz.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/vibulurisorojagupef.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/sozumebomifo.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fe381e86---85567198559.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/futewefamedukemogeneme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+5+robux+for+freePDF 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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 10372 bytes
SHA-256: 444d013f6484c4847f9e8d0f153b2bd32263c9c3c5809b2bb2853c212cf2ff6e
font_01_sfnt_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 17784 bytes
SHA-256: 581e1e2ef6431741e82c83fe815120a7bace2868883f40bfd1573003d2dbd824
font_02_sfnt_off00011d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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