Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53e274ab6042109…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 06:16:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57442e76e0d70a5cfcfe9ba6df8dc2f2 SHA-1: bab0719fd8577a2f39a7b05d5b0bfa08368236ed SHA-256: f53e274ab604210972d8dc4a835bb76e6a593040b4009bf86d0a272be0473dd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links hosted on compromised WordPress sites. These elements strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=android+app+for+free+web+series PDF link annotation
    • http://aurastaffing.es/upload/file/xozemesaf.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/xunatusew.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/52660140330.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f0c2db5855fe3a40b99828e44ef03b03/munazes.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • https://linardi.ru/files/file/27937293194.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ckiau5kjh0gaffl0b69qkqkvi7/79455569383.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/rekesugipofuvala.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/bijiza.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/rodasubobonevino.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/duvuzuwafu.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/22535849003.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/wesidamurawatewugasez.pdfIn PDF document text
    • http://farashimirooz.com/files/6285334477.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/95028472936.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/38893030889.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/99453163191.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109121131399340.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/83469276461.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/37533724848.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/juveliwuretoze.pdfIn PDF document text
    • https://medtek.vn/storage/file/66114022822.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16131f39abcc19---29513401875.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_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD64 17228 bytes
SHA-256: 66d7f3e797cfda43b25e17325da157114481413c407b127b8612187e6364ca0f
font_02_sfnt_off00012a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A10 10552 bytes
SHA-256: 6632cd5a9e64f33ffbb98c7243a95bde882939ba7e98402daf8d496377c9f05a