Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0e1a3fac22b778…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 16:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cae05594043c598803ce751b301b3f33 SHA-1: f1b3d88a1449e72f799b31bad1b80207453514ce SHA-256: 8b0e1a3fac22b7785de2e2b76e6dfabc8853cd26b3097d5c715db83926a7e074
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of external links and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://queure.ru/uplcv?utm_term=20+degrees+to+radians+in+terms+of+pi PDF link annotation
    • http://metamorfoza-krosno.pl/userfiles/file/vuwubijunixav.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4v8e0knh0tf0u9f04490qa686v/63399332154.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/35700372376.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/fowinobemeronetema.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/nuvuponojebu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390da88a4b5---rexizavozutalavozijawife.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n6lgi4eigbmf8dn2bdvseisqqa/vesudagimikovekobotaravaj.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210919_142209.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/wotukejenevo.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/xijivifufimaporosa.pdfIn PDF document text
    • https://kawanmto.com/contents/files/kugisapawo.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210915204125.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wubesesora.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/buzululederi.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/tavorekupifazuwedumor.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/nixonizogebizavo.pdfIn PDF document text
    • https://mkontakt.com/dat/file/65313815476.pdfIn PDF document text
    • http://adice-area.com/pictures/files/tanenaxozetovesivaxesoz.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/tugagixunuperebamafil.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/77730405643.pdfIn PDF document text
    • http://gyliver.ru/files/files/55839449551.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/xudonopin.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/18144226749.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/koxoguzefas.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f0090fde7c7fe298f95739697e974649/suwenujogeramax.pdfIn PDF document text
    • 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_off0000b244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB244 17756 bytes
SHA-256: 43768f8e1939b60968290e298c6d04f0e42474209a69d351ebd3b77a20bf474d
font_01_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 10940 bytes
SHA-256: a47d2ae3893a60dbcd21905da1c3446fdba4adf58207c5e561a3be3e22b88c89
font_02_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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