Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0b2e61fe5923e9…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 19:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 348f1d5d069c0b56abf77d0ec65ad496 SHA-1: d24aa2d2a7f08d2c8c2e4753f2ea341d219fd367 SHA-256: 4d0b2e61fe5923e9ed533b2a35988cfea5572649c4ee708c8e856cf546e4015e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to malicious content. The PDF structure itself does not contain readable content, but the presence of many external links suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://pixomot.ru/uplcv?utm_term=manual+testing+openings+in+chennai PDF link annotation
    • http://gsmontaggi.it/userfiles/files/zepasibuvopaxowezarijudo.pdfIn PDF document text
    • http://prograsifkalip.com/files/firadeverefodezatud.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fixupuwunujafapujab.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7000d2288---fepobowowokugig.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/901ihm9vfqik45m2v3icklgtgk/81373948248.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/022adb1ca713742bb771b22d840889ef/90600335892.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6cc3cc89d22e27d3d0e9aee6ec8bf5c0/35664357331.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/jnh03sumo1nr2cu6n8le1rfttf/jebama.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/0e52e8b5daa8d47fb1e2f11755d878a6/43258984766.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cfc3de822cff88e1053b1bf2ffb30ee5/rubumaxozi.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/39668003551.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///56163427116.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/84906098194.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d00d55f4.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/8grl6uu21i7uu4p4t33o2cho86/81601622217.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b419eb088---wigapoluketuminufa.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/nukibelabira.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/gujonezirobidovasukebiw.pdfIn PDF document text
    • http://sinoorchids.com/image/file/vifus.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/mumurixulewodupopomopuban.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/vajodipisowuvimegojoj.pdfIn PDF document text
    • http://stl-hk.net/userfiles/51558888878.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_off0000cafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFA 10648 bytes
SHA-256: b4d32964bccb358a12732e0db620268b878e6f81cdbe36bb91d2072ceab7d14e
font_01_sfnt_off0000e347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE347 17920 bytes
SHA-256: bfb0e181c544d4edcf8bb65dddc77989b493e178620d1573733699af776fb253
font_02_sfnt_off00011203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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