Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb99ba8e0c3f4116…

MALICIOUS

PDF

85.0 KB Created: 2021-09-16 21:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f3771cc6e6d2d610402d89ac41d0655 SHA-1: 35de1db55e2f66d2bb24cf7f0d51854196843ffe SHA-256: bb99ba8e0c3f4116d2b31196854196507c77db1b1b62154e90fb9b514d1dd26c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm intended to lure victims. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://nomylo.ru/uplcv?utm_term=redmi+note+9+vs+redmi+note+10+compare PDF link annotation
    • http://youngshiny.com/userfiles/file/1631544541.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/54860864726.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/dikezepap.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/76428468181.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/remonejitepusobodikugu.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/rofasesufufegu.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/7542943336.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/xenibevizafogusutukobef.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/vikuvulejitazet.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/fopurumopexonewirejux.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/99256935896.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e941aea3a---66280822244.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dbfb0e42c---51199492314.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/gaxawojokefonogopogup.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/tinasaduba.pdfIn PDF document text
    • http://julianina.dk/upload/file/pokekolelunik.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d601360602---90108756963.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021991310336588.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/lozopobifukiratadezomuses.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/31082771778.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/64495223108.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/53837381482.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a3b46c9403aec17913a0224a131b3769/jeloxejogofufepukazogelij.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/62763366305.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b55f6849b---31917204383.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365a1aeacbb---mefunepadovuli.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/50651255022.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_off0000e0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A9 19496 bytes
SHA-256: 1d7647cf0e69f23cbc34b0be0d101a5f0c28eeeefa5e299fd3f71cc85bd26136
font_01_sfnt_off000113db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 11080 bytes
SHA-256: b88a5ee20290c22afd446a4c3b570e7d3266b96206831f94935664614fc9a417

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