Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa85b0c47e6f214…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 07:06:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3dbec0727dda48dc53bcddf6ccf244c2 SHA-1: 38dfe7ddbd260ad3e81e0d8bc08e569228ecf0e0 SHA-256: 1aa85b0c47e6f214de1e49507f52dce20bc5178af63a7954a684cc079f6ac218
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://kamkmori.cz/ckfinder/userfiles/files/23225716965.pdf In PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/vizupojasulamapivexabid.pdfIn PDF document text
    • http://atrsara.ir/resource/files/11736739177.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/64722727736.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/pelolureruwadene.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/48255745323.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labejinerinamakul.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6407bc724585ec370382a9116cf5ba44/tefeko.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613976ce1122c---42021335810.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/27009213356.pdfIn PDF document text
    • http://zerosquareonline.com/file/55522482072.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/c5a015df06783841c7a6d1ff724e08a4/21952027698.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/e1jl8c56m3b9g0n9ubkt6oqj44/83993319151.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ae064901d---50730864151.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/fijaserugipawufasubofe.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/25772748972.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/38561263972.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/77713085873.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kl0780kfuiapfukkfac7k47n20/wisujefolipepiv.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/31615435700.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/70837730046.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/zamem.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/pifidixiguvemobejawojid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=noclip+cs+1.6PDF 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_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 10036 bytes
SHA-256: 4edc50e0bbba94f094b6eed71cf3a338dd64c28bddc26d044e2239ec4e2cd91a
font_02_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 18156 bytes
SHA-256: e4470f90c58ed4e77088e105e6e49ff238f122f66850b196e9888b8994471893

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