Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d025be75da5ad52…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 01:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7064b9449e7702899f9327ffa440acc5 SHA-1: dfe4d15bb5f49d3164b432ff60fb19e0c23e4a54 SHA-256: 9d025be75da5ad522c10a6d8781bd5d78ccaec0c02d37a7d8d9323a7b7f3232c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://kechengchem.com/upload/files/votopeg.pdf In PDF document text
    • https://groupburuemas2.com/contents/files/56344848040.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/13011718057.pdfIn PDF document text
    • https://gameclub.by/uploads/files/bunewevujapexefos.pdfIn PDF document text
    • http://synowka.pl/galeria/file/befojifakelusupaludajata.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/ratonedarufakemam.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/53191302398.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/xitepixupidajazori.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/909050208.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ca9dca8131f6f666638d93ac738a01b3/niwadivuvanipepujesim.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/68014526389.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/53829936158.pdfIn PDF document text
    • http://abworder.com/uploads/files/35650701635.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/jijufaxivu.pdfIn PDF document text
    • http://sin-hua.org/userfiles/nuzig.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f1151917b0daef426f7a211ea6ef2106/81376858648.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/fibilegilesaxazep.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/82932066722.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029a5b6fc5---60141146865.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/2563544830.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/kajuvibo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e995b800bd---pijuxukijuxirako.pdfIn PDF document text
    • http://bankerz.in/qpic/files/robizakatoretekutifiluv.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/45567631823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ram+pothineni+keerthy+sureshPDF 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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 17844 bytes
SHA-256: 7ecb01463f46919bc6c7b2074715641eb660752b372435aa6dcd31957631b83a
font_02_sfnt_off0001249e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249E 10820 bytes
SHA-256: cb4140ad7467d99cb83e4a1032a71d6d852f94a08fe239657739c83134017e8c

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