Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6b07be2cf12ca9…

MALICIOUS

PDF

104.3 KB Created: 2021-06-26 01:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 984382021f4ca694341a2ad8a88ad6e3 SHA-1: f75ebd4cc1382a222f18d6eba76705a455628579 SHA-256: 4f6b07be2cf12ca9a5fecdf581cd927fd688839a7016983dea2de637e23e3550
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9358

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://ascinfratech.com/clientprojects/trading/file/pojelabujelanibugamap.pdf In PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/rdil15g0uumh5fif4ak46a1u4o/13680564568.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/22031564716.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/potawit.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/4646471092.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867ec0542ce---gizokexebelima.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5e1d2b6b913d9f01ba0bcd2c7918900e/22705542308.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f8d9283f9---kewalavinonademikumaz.pdfIn PDF document text
    • http://whewfamily.com/clients/12004/File/65289792282.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/2a29e459442ad73a8b25da954bd26861/80944368544.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a3d3b257---85286808413.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0176d70e5---korunubeteruduzos.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210531194417_mfsyjn.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f08874002f---bujuwaxukidovesavu.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160780eaba4ed5---79250242506.pdfIn PDF document text
    • http://hydrem.ru/images/file/wapazilafekonutonagedapu.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xibepidorojejezifi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a16476ff88d1db5ee539e9391a427587/9319719202.pdfIn PDF document text
    • http://allycatering.com/userfiles/2301887133.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2697abc54cdf8b1127cd9e31ede1706a/sasexigezebano.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-16/20210516221419720563.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/poxiduxezawisokovadiduk.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762068ebc2c---roduvadifedajimifexa.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160797695e5895---suwakaxugivujokera.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160899296cccca---fewidiwunapu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a21c33433f---8081221416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+meaning+of+afflictedPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00017489.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17489 18492 bytes
SHA-256: 532065c18a73822eb779ad3a44101f640b8f2b88fe10595a5a6b3cf1e3070c9e
font_00_sfnt_off0000fbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE9 24412 bytes
SHA-256: ad424d0e7783026ef32b53ecb8636711867a23d0b5063ca560073a5e8c637cd6
font_01_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F31 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
font_03_sfnt_off00015cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB1 10620 bytes
SHA-256: 07754f2595db65cd310e8aceffac994978f11e0a7ff64ec07016335819c30f6f

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