Malicious PDF — malware analysis report

Static analysis result for SHA-256 a775c6f08f6933bd…

MALICIOUS

PDF

78.8 KB Created: 2021-09-19 18:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: be059061ea84ee08c52812e4b9c4ed32 SHA-1: 33874131544df366f6a1749dcd4d80ea25a48b88 SHA-256: a775c6f08f6933bd2605bac9c4319c078da5b0455dbc25b19c15b16c832eec28
176 Risk Score

Malware Insights

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

This PDF was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing sites. The document body is unreadable, but the presence of external URI and compromised CMS upload links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cructi.ru/uplcv?utm_term=android+app+to+share+mobile+screen+on+tv PDF link annotation
    • https://stpm-sa.com/userfiles/file/fatajetutugav.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/40620255786.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tarezevawizajenipuparejir.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/gijidupopuwebotiloganip.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/77332701730.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/rixomafanosib.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/woxesapudizomazadije.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210902072808.pdfIn PDF document text
    • https://bczenekar.hu/files/file/xitugomu.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/48132963334.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/24391305509.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/1099869815.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/telarupubukog.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/54324065208.pdfIn PDF document text
    • https://tepihtrava.rs/files/5858164828.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/saguwijeb.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/rcfg5vn9pud54nouk161h7muuc/68488251297.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/14561915643.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f198189e1403363ec2db7696ba03ceff/rijetojazoluxulixiwi.pdfIn PDF document text
    • http://fitviewer.info/files/file/63293647553.pdfIn PDF document text
    • https://ckmandarin.com/uploads/62954536950.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/51871886a3d91c710cac515f47c21305/34170864249.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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 17324 bytes
SHA-256: 0c3bde65cb632306ec3828cd66ba85861f793858c731e7597d5c6b5e59b9fd6a
font_01_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 10964 bytes
SHA-256: 737a4a70b8a7fa0d94512ea8b94a372f95b57624e6b34ff19ece66daf29a4c3b
font_02_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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