Malicious PDF — malware analysis report

Static analysis result for SHA-256 276c404b1677c525…

MALICIOUS

PDF

90.2 KB Created: 2021-07-05 22:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44e40f5f4d56d81f544c023b16609e89 SHA-1: 5db61fc963c240141ff6d8315c02a1c4b16f75e4 SHA-256: 276c404b1677c525c66ecb9e849ec1d45acc5b11d09eb371b539c83659d34106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve to obscure the ultimate destination and evade detection, redirecting users to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10264e8c---bovuwudovukopibifoga.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b35bd93f139---39793360681.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/fafepolozakik.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/49961046074.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/45576046444.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/116160d82ac24ea6148d440cd1b04151/80738902699.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/7034182130.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d3002f6aeb4fffdcff59f13ffc567431/63213058399.pdfIn PDF document text
    • https://monyetjoget.com/contents//files/67867120618.pdfIn PDF document text
    • https://kede.org/userfiles/file/lujebupepewonamed.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b99b85c6557d7a4f62151d446d9850d4/tobifudasanedufetawojoxer.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a452aa5768c6808e4315c622f2ae81b3/42401470245.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becd4ecf695---94364005733.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/49192542423.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/30214845557.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/m2bg27u99o6tgsouv45ajmvqv2/59574519148.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/bulatajariwumakiz.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/da94b1ebf253262976cd9b1c606f0f7e/28992957762.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/xubegaxuvujeg.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90cd99fad---dizoxabojurovezeju.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/52b28fad337f14ebcea423a1832eec25/favapefon.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/23679894740.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fb527b84a279fea4a4a18bbb3bfc8090/8504685858.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a36976a5f---71496365396.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/n19hcobqsfjq96om5j3q3725i6/71334360578.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6cd9a1e7712e5868441e9e2c7322c571/tugonunovumeravikib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=building+integrated+photovoltaics+pdfPDF 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_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11241 11120 bytes
SHA-256: d42e99384d4270c2d252daeb29fbc7f084ccd127fc3bc98ca7d10158d045622e
font_02_sfnt_off00012bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF2 18568 bytes
SHA-256: b7228808ec6056261261c74116aa6cf0ba56e04a99d091bee33cce273f55db33

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