Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6267cb98c238957…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 18:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36a619bb6d2bc01583051bad9e216292 SHA-1: b2f3bcd30957190ff49d1ce1c794a9e562a81eba SHA-256: a6267cb98c238957b6f4ff85e60849a3141bba579abc8d1b4645237546ef481e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the presence of numerous external URIs suggests the primary goal is to redirect the user to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://distriparkbotlek.nl/userfiles/files/tisibeduwanenugo.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd214d9cb7---mudin.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xunezipe.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/96668177255.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/3258404308.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/20919921396.pdfIn PDF document text
    • http://dalaichau.com/files/mozojiximasoxexip.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e3a33d6a5bbf8f08025634bfaf710976/zedukuzumokusuduzatuboba.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xadofuvewazomeso.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d1f65b1cf---18687994567.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082b9f5f396b---56434769558.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c686111e0d9---xewubanoworur.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/4322592874.pdfIn PDF document text
    • http://muszempilla.com/files/file/40018855340.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/ef01e934086849724b269688f10536e5/gipixalelaxap.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1719cf1d25c9ceac991826fb930eba25/terotekutugikenimu.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77089388229.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089f7e7329ae---83618684245.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zadatevonewel.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210628094457.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/48375300753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cara+kerja+jantung+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/nirexujevuzateru.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_off0000df1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1D 10600 bytes
SHA-256: 671bce44a2611edac02ac27dc0c380e1e970fbdb851794d44bfa739f3c082671
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 16412 bytes
SHA-256: 2c6981d015f287e27da4fd5c2a6d07a2f43a31b5fa4321d604466c554fbfff44

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