Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c97499f6390b673…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 20:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ae83ffa1848bd2bc7eb9112e46a48eb1 SHA-1: 7c56819bac37ad3bacc02440a9d5cd96ca7d5f60 SHA-256: 6c97499f6390b6735d45afb78410084086df7b5afa4a6e4a3b526adcb32c915f
196 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which point to compromised CMS uploads or disposable hosting, suggesting a lure to download malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The primary attack pattern involves using the PDF as a delivery mechanism for further malicious payloads hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://allytemp.ru/uplcv?utm_term=supply+chain+management+chopra+pdf+free PDF link annotation
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/xozosunu.pdfIn PDF document text
    • http://yanartextil.com/firma/files/nokozir.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/13087545832.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/dorumedunizasarijani.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/97090484827.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/pefitibifogefolotikixage.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/13706829455.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/211798374.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/38805162017.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/27451031390.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/kozixilaxu.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/foxejitidoxuxikoneral.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/21048846055.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/vogujagidiganilepovizej.pdfIn PDF document text
    • http://sushi-belovo.ru/files/19103925315.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/42a06b934b3157bbebaabe092cce8dd5/19971305611.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b1c0167970b89b5d19013a320e6fb332/95422811850.pdfIn PDF document text
    • http://kanizsakran.hu/userfiles/file/14731081967.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/vezexidopegatuxe.pdfIn PDF document text
    • https://alev.az/userfiles/file/16021837831.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/95615668076.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/pusobedagigimaguxebi.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/56489567450.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/kosud.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l8ojc23hq034i5h95ee9atsk26/fopifiguku.pdfIn PDF document text
    • http://vswet.ru/f/vaniro.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 16544 bytes
SHA-256: cad767da0d4d7385db11b3fa0186eccd443dc5041a9bfb03cf0dd16619036854
font_01_sfnt_off00010338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4F 11188 bytes
SHA-256: 1e53248edb77a756fe259a1b14150b377468081d068b4b5419b1a087d58bcf8f

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