Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84cb0fa8c1f083d…

MALICIOUS

PDF

89.2 KB Created: 2021-10-09 00:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 15dabd20d323db192d99192c150054ae SHA-1: 95b22593107567803de1452ff136581ca06b6168 SHA-256: f84cb0fa8c1f083da8d25630064776bc194dcc6a46da7e350024525b896eaba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm with numerous URLs, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://www.de.ruben.pl/ckfinder/userfiles/files/kavuzanap.pdf In PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/funotowepig.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161454924924b8---69752431728.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/60625132065.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/89774955088.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/gujodelamanigodiduzepufoj.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/gejadoz.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/xepufixunadojotosadi.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/rubegelazivinuxovega.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/towutesurizagifimu.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/futufekewavoj.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/79357059266.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/16932817099.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/16483551346.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/62990688719.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/12838948259.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/54599599850.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/61457383913.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/naguwagukepisulifij.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/94118805053.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/694984e1a698a60fe1c5903e279f8f53/nasakagatesagexofukogogi.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/96203524322.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/45a42c0a6df26e5f1375271b35264457/35626608440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=can+you+take+three+birth+control+pills+in+one+dayPDF 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_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 11088 bytes
SHA-256: 52b0620fd8135089d0804df55346d350af85c4110abdcd806a825924fc34d611
font_01_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F7 19144 bytes
SHA-256: c232c9df870863f678200c479739d31c07e95a91c3107072970db16e721ec5f5