Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e770dd1c5b2e9ca…

MALICIOUS

PDF

81.7 KB Created: 2021-09-15 13:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5ff2ffc6b9e46e637c607ee3ce297c9 SHA-1: 8eb2322e9131a957cb249bd6371b35547020ce97 SHA-256: 3e770dd1c5b2e9ca7ddfd553ffaceb59e2aeab303332a4e661ebe32877c726d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to external URLs hosted on potentially compromised websites, such as 'altrus.pl' and 'alismobile.co.uk'. The presence of a 'download button' heuristic further supports the lure-based attack pattern. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=pscc+apk+download+2019 PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1739fe7aece67f5aba7a0de28b6b005f/pekonoremuxotimaxim.pdfIn PDF document text
    • http://ace-pharm.com/upload/files/17912415227.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/zazowojekomuda.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/tawanogomexa.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/42284913232.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/favatunuzida.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134fe3ae3b96---87848919935.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/47632687158.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/vorugufegisizorexipemamot.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/rojomiku.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/13412003233.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/xovivanimosunevomam.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/42555268260.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109031854388287.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161354fb625374---83948981927.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/botozararefumasijilaseda.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/71662403240.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/wuvijulepuvojuzuner.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/nedel.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/xadaradex.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/rigosawo.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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 19020 bytes
SHA-256: 63889a69480661c8a37e9d3d97ba600e8f3a64706f7f78361394a279657a34f0
font_01_sfnt_off0001088e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 10724 bytes
SHA-256: 3441da880c0292744647d064612f2e5f8bcb6469a2239f4ed8ccfff16f6457f8

Open this report in the interactive analyzer, or submit your own file for analysis.