Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aec79c37a15ed01…

MALICIOUS

PDF

79.2 KB Created: 2021-09-14 06:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 70bce7d06fa5b07d1a3dd482c94b0cc6 SHA-1: 6b3cce851cd043a397adb4269c195f4ed1350b8c SHA-256: 9aec79c37a15ed01cebc3e37e5e7baff9c5ba6dc41402477a1e9ee53b68cd4f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to phishing or malware download sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=gms+core+stats+service PDF link annotation
    • http://aallergy.netlovestories.com/upload/files/watejolop.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318cf495a90---73276874141.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/15182750975.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd6283b560---xuvizogogobanef.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/bidixatovuke.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/rogonade.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/bisimatosaboze.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/petejagipojonumife.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/remixifegakusesugiwuze.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/419060379.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/karixavasatufuverote.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/36121440091.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/92329517918.pdfIn PDF document text
    • https://auto826.com/uploads/files/xovisabupofupar.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kepojibuwakizi.pdfIn PDF document text
    • http://benetalent.com/upload/files/zuxodisuzener.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/xekixorenot.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/4732478891.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613320b7d4dcf---povipevuporuxo.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/52948497431.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mujepuxaginalusaxa.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/ratazof.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/47958497242.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/8205380516.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC62 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 19444 bytes
SHA-256: f3e3bf1af1888eb9f9aa6c9d720c3b370185c2ca493e5ad7402ee2662b3aab0d
font_03_sfnt_off0001172d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172D 10344 bytes
SHA-256: 7625738698e53bf26dcc21c370c0a683643236617f6f6bf9b8cfa5e4efef4f3e

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