Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cb91335e0e458b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 16:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91dceb9be1696b41ba4a90f03fa33007 SHA-1: c12f435f46d1b6b2a8176085a59fefe4b48abac6 SHA-256: 14cb91335e0e458bd83ca699ac78fc123a38e5f9a83a7e65b0af788bcc1c62cf
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 document functions as a link farm, containing numerous URLs that redirect to potentially compromised websites or disposable hosting. The presence of these links suggests the document is intended to lure users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF's structure point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://musikpark-live.de/userfiles/file/23603761555.pdf In PDF document text
    • http://meteosputnik.ru/userfiles/file/85576735118.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/sekimexadulibobularuga.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/45554911712.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/366d5f51e6f245371a20eab6069f7bea/4513062954.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/jeted.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/10084120299.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/dizajesutilamexomizid.pdfIn PDF document text
    • https://plasy.com/uploads/file/wobemefasutedapi.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/75457095223.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/57999137457.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819752c3559---62106606413.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8eb3183ecf---87829386031.pdfIn PDF document text
    • http://jucal.es/images/file/40870229902.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/najotupaselata.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/81881477744.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/vosomavegupis.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/durodeketuvuk.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db241bc168b---sufizogigowaxifu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/sh3k71nd7hklqltfiuoogbi7f0/bubimi.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/77963705233.pdfIn PDF document text
    • http://retailcop.ca/files/gejalorejaweridutid.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080b46396137---12891696491.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=trigonometric+functions+formula+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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE829 11024 bytes
SHA-256: 49fca09a28237fad5515904593c3e74e85fabca579ca338e4383f66467f6f764
font_02_sfnt_off0001018d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 18500 bytes
SHA-256: 135b258b841a26a8aef55a3028c47063b71ee083423a0c159ab733c5099c05a4

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