Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02d9c869c2c6e69…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 22:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db819c31c7e1c0c61514e9c92a301e46 SHA-1: 476af5bf8c097e4d1df19be7f9b2838eb688f4b1 SHA-256: d02d9c869c2c6e6950b2193a5e62f6f21c020d735b13fb9077392ee08fbe1f41
164 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this, aiming to trick users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://0-50.ru/userfiles/file/wilesex.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/16de8a783a3452726ba8d155a96dcfac/94138979269.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/27403929424.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/reduxobemanorowagigi.pdfIn PDF document text
    • http://arsvet.ru/img/upload/12566089006.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/bodovoneporamone.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/malusinunoluk.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/gowigalexatulerideguxuka.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/52818390185.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/fanomezerubituvatiwolow.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/11446520340.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/vojir.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/10817758505.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/73c81098ad75c8e9b03410a35ac110ef/wixisefimi.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/togiwiwisopudilazov.pdfIn PDF document text
    • https://lorus.rs/files/76732018959.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/wadiguwikabavu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5ace4beb5c501e92954e425c1750d559/xusaguwaz.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141105a79d9f---xiterejopovonomogi.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1eac7187a---60560831620.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/velarigopabojek.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/xapenojepew.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/37821674776.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/70504676820.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/9q3m4afotves0stagjnvb2oca0/zezegobikotobituko.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/tutolomemawoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=new+english+movies+downloadPDF 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_off0000dec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC0 17140 bytes
SHA-256: 1cbf13238f8d4defc47238e0e340086c73890ab76cd3ca2d3d15a0fff3ed1a20
font_01_sfnt_off00010b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 10628 bytes
SHA-256: 95ddfcdf1f7c542a4f02021324d2ad6839fbec2f5d85e73c30620680595d76e1

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