Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f2b22ed43f037e…

MALICIOUS

PDF

83.8 KB Created: 2021-07-13 21:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8784e622beda20511c8dce82e2622578 SHA-1: 02860b63d4da1c768df6bf564cadb69a1f653d7b SHA-256: 83f2b22ed43f037eaebf9edadf78d7081185fedcb0beb727cecfcd3031f49597
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and the nature of the links suggest a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b3c5c0a50a71a627b0974c170bb06231/bulagejobawivoduxadave.pdf In PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e66c1ed9e7---93196185037.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505203439.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c89668d90d4---zidumoxivevalebutoxatamov.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/97958743478.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • https://lapakunited.com/contents//files/gopeketaniges.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/lomenokasawurebufulisep.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/feluwumizezusaguvudetoz.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sisizere.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/mazowe.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/rokabu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076309dbe779---22073130229.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/zeponit.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/19526149726.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/93944062702.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2fea15a6---88393613373.pdfIn PDF document text
    • http://ned.ru/uploads/files/midedajowidegibivezim.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/fe9b083fd3d5c80b22a9b88174677019/62462482930.pdfIn PDF document text
    • https://tavio.ru/files/file/90032717044.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609148b03b253---tunapizitekaworogas.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/kuridazezogonipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+different+type+of+trianglesPDF 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_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 17148 bytes
SHA-256: a1daeaa1a7a9dda63c54c69f16f1d95f36bb7e4691401e43cbeb20511961b399
font_01_sfnt_off00011161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12978 10856 bytes
SHA-256: 2c811bfc822ac674ae4f686226eff78eb8c7452755962367a482c6d17df16abc

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