Malicious PDF — malware analysis report

Static analysis result for SHA-256 81988559f83ebade…

MALICIOUS

PDF

89.1 KB Created: 2021-09-12 23:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c3e9d63c5ea264446929159ce94697cf SHA-1: b95bd1690578c9b0b810ee4ad84c976077057f8f SHA-256: 81988559f83ebadebe16c0f8f703e9ce81f8e4faab9a92bc2df9cca840d2c19b
164 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites that host further PDF files. This suggests a multi-stage attack designed to lure users into downloading more malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613060f896713---zaxolex.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/k099e1c6f1h107pupbqf2belu9/rosaluseja.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/falagepemuzexotox.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/26115555043.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/35122790664.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/daledosazenelivefozuxaf.pdfIn PDF document text
    • https://guijek.com/userfiles/file/56137222297.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/tamoxaziwijagaf.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/77273161633.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/b22d0fc2b61ac869f40b56cb45c8395c.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/90772ba7a15cb5fada4190e3450b0fc9/99794559200.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613738df0bb47---latalisilenegoribubibasod.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/82963678527.pdfIn PDF document text
    • http://gptools.net/userfiles/file/midifojakim.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/ratipox.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/66405816377.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1oet49pcii44ctreqpd15drrt1/93903604135.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210902090820.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/97170733593.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/jujujoxilepexazu.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemakijijosiraker.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/79216709400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=piano+tiles+6+hot+songPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E2 16840 bytes
SHA-256: 637f282a09958e0217b626fc4698b4d72005eb4dad7007e6f209d5e5c10a4ef2
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 22612 bytes
SHA-256: e63968c61f3fd9db439eee1d8fba31c40288228c6dfbe0b84875fdcd24923a79
font_03_sfnt_off00013eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAE 10456 bytes
SHA-256: 183ca7eca8c36894c6ff515e3945052432352a9d12bcc55f841f7ca8ed478f38

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