Malicious PDF — malware analysis report

Static analysis result for SHA-256 944630b7699accb3…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 11:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7411b3318176aa55f6b479d6508840ea SHA-1: 6262028df4328ab0382b7f192516f95fb2744028 SHA-256: 944630b7699accb3ac05c15d16768cefaa2e244683e19ac52aaa18a7b9925888
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wohntraumgmbh.at/21832447925.pdf In PDF document text
    • http://umhouses.com/uploads/files/nepelupozon.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/bunijijojovosuk.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be54b013afb---totovubusapigikinimevavap.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/vedifaxopisamir.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608c76bed3257---daxevojedametefodi.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/vokojasipugusakitujanolu.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/12654111860e4c34f9a30c.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1577a81a1c---rigid.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/powetemavudoxodawo.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/54922890407.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081546768210---xezobejobezomu.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/sonobupuwawitumobivujuvi.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/joruxubetotevuxeninojog.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a847e49863b---8167210883.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4990d83ae9---satodozanagizaludefiwok.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/rifefofixabotum.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6aa72e075---58735681718.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/worawo.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/buzarivurivulipewujuzobe.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/luxubejexemedusun.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/pixipegixu.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d48335b18ed1ef55768ed1d3987ef0b1/nasava.pdfIn PDF document text
    • http://vtaky.sk/media/file/doroxanonewita.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/710dc041b95377fb94ee56695346ada2/sutilumabapavujejizaf.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/11220163973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=convertir+un+fichier+excel+avec+plusieurs+onglets+en+pdfPDF 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_off0000dea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA5 11196 bytes
SHA-256: 7446597adc9a4668027abf241bf26e220d31b752b26986a7c69c042f81739997
font_01_sfnt_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 19368 bytes
SHA-256: d8e6887a998639d96b0e7460e14a1415969e5d6ae8876a6439626cae996c2b41
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1