Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb32273aaab4f69…

MALICIOUS

PDF

81.5 KB Created: 2021-09-04 08:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b061c0cc3a7d082897a5d87306fe0eaf SHA-1: be9cbdb33026843532f62057bf5cf493c8be871b SHA-256: 2bb32273aaab4f69c298fe873788ad031c9268dc6ba69bf5fddfc13ed050f437
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and exhibits multiple high-severity heuristics indicating malicious intent. It contains numerous links to potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://skinanniversarymall.com/userfiles/file/28919481764.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a0b2a02c---7497587925.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/sexubetupufanilu.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210614175334_ughgpi.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160920a15c904f---mawavex.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/33387285291.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/piwomozuv.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4110c7dcb4914f79b10b32133d17defa/72045491970.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/61527455854.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/fapiwunekevomebonusavone.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/retitepakole.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/nizuwimamemuwagobuzosagap.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1576543644611bef5b98984.pdfIn PDF document text
    • http://186086.com/upload/files/ganazimovatekusim.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e0f993519c3---paxeruketituxuzivagas.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b7a01f52---88797378861.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9efbbe5e---tojemuvopajadorefezanemur.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/narojuxojurerafobi.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/mizanobuxasababa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79c14dd0669fa0a1bb2f77c2d019f7e0/16088806649.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/9m08gn408oeag21cttbq650j1i/ximiwibonewi.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/jilufajuloxix.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/56787625212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=lines+of+symmetry+worksheets+grade+6PDF 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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 17816 bytes
SHA-256: f6f0ac4a9a87d66e151bc86f39154d6f898ea573c1749862232efa66e9eb4033
font_01_sfnt_off00010646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10646 11172 bytes
SHA-256: bf58f9b45f141cdad24d891c975dca4dc840d3f6bc8fe06d22814a18072e3104
font_02_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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