Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa0b735bea16e8c…

MALICIOUS

PDF

92.8 KB Created: 2021-07-30 21:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6ad2361bb9d035935ce72abe2461de6e SHA-1: 8dd530da78c7933b7fe5f9fb7285c8c9d6c97377 SHA-256: 5fa0b735bea16e8cd25b2786996862c3290105fcb3666b88ae114cf5e203636a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely intended to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://ketchas.ru/uplcv?utm_term=download+rebel+racing+mod+apk+ios PDF link annotation
    • https://arab-hams.com/Ups/files/35391348212.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/55d4ba70f7571c8ff1b8c9b24a24a076/bexarivebutupozufuzewepel.pdfIn PDF document text
    • http://zgic.ru/!upload/files/tinomemevinekut.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d2d0da14b3ce79041b2f94d8c37c8590/23570871994.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/48045340956.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/kaxasupo.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/13953871985.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/57752221998.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/f70714a73f96cc75eaf877c4691fd884/bawekudoxog.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/gasogawapoxufavutesis.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/985a9a19286e3ffc5a9d544bbd5a64bd/wixobip.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kenidowomukidumi.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e4976c4ec699da55b9213acfbe4d6468/17343838264.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/68543111750.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/vixefapewufafoxikaferig.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e0ae768d3bb---ramun.pdfIn PDF document text
    • http://uci.ir/userfiles/file/71543426328.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rs342g6i9300pvciddvq31fm2k/68837577918.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/5893887550.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724eb3a8506---lepud.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88909118937.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lirevubonazorutogivurat.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d9ee14cd---veripibupikajo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/tilagojosaxeruwipoduwago.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/17226759238.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/pupifuguvazoziwowolijaseg.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 11076 bytes
SHA-256: 1bb0262773654d46e5887ccd251c3b7e750b92352a758a86c00bc7af3f922c55
font_01_sfnt_off00010af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF8 17008 bytes
SHA-256: f0bad764e30aa91d9da5523482e1fad7dcda30d28718404e333f5a512ed6b48e
font_02_sfnt_off0001375f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375F 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_03_sfnt_off00014ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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