Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af44655c916527b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-05 19:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f80518ecfe0b5f040a55490e2bd74b98 SHA-1: e09432638a9fbd21bd1b1dee0c2eb5068550bb4d SHA-256: 8af44655c916527b595c3d20fe9fff0280f39acf42c2018a9184f001a23cbae5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, and contains numerous external links. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links to compromised CMS uploads and disposable hosting suggests a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pointerboards.com/uploads/admin/files/22980970449.pdf In PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/xilesupajezitegum.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/73264212821.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/j57lutm1d2g1f5urqut4i4k5d5/nowosum.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/kowonukamazajidudebo.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/6133922715.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fs28nfnfibck1pmg37gmrpjmq7/7677495646.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/jovupekedirejevok.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/juzezokopebofekologani.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b063f7ea4f3---juwonimus.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/22664145091.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/771996a2f8e7d99bb02c9cdbcff32db6/mololajajepowaven.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/494075eebbb16bd7c22cef37ac56d998/8463722629.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/wevuta.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/4953f19c7adfbb48bc6bb432dc63e88f/71246969817.pdfIn PDF document text
    • http://lyshiying.com/d/files/64434873976.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/robosumolegikegukiteve.pdfIn PDF document text
    • http://artside.org/data/temp/file/67218398905.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd0df1bf05---84279335801.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/11lee7v11t8mgk4n21d550cssu/17826265619.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/5929358194.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/1c3e5bd92db963da55c1f7d33e097c03/421473263.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/04huc4av81oogm9dopa6sb3d4r/6156613348.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=khana+kaba+ki+history+in+urdu+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_off0000aec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC7 14116 bytes
SHA-256: af95eec06c05c104c3888d68434dd9a049ce060eb20f61d94960cecc329464fb
font_01_sfnt_off0000d182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD182 10856 bytes
SHA-256: 38242fc1f8cd03889dc00dc65c20119244262169fff4897c4e3c48066fedd889
font_02_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1