Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bcdc35469d8fa4…

MALICIOUS

PDF

79.5 KB Created: 2021-08-30 12:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8b39d41f226c1aa3856904c752e02b5 SHA-1: 3a7530d0b9d3afe4c2b8b01dc25972d3a08b8c03 SHA-256: 09bcdc35469d8fa4445e8a1b1a953149351c6672eac7275f6541c741da27ffe2
176 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress sites and an IP address, suggesting it functions as a link farm to distribute further malicious content. The presence of multiple PDF_URI and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c217efdee0a---nidewiwuru.pdf In PDF document text
    • http://gfzgt.ch/upload/file/11588987293.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af1236650ce---kazaxomejapusisijomo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccsnnsg3pn0v6k9n6khkno7v5s/degigufasuroxamove.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/337f63e4802d4ee8ffa551bf21fcdff7/75875982480.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210616124639272.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/vatozadege.pdfPDF link annotation
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/87guvhusovk97u88mh8i95ar3h/mirokewazosepirotin.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9abe3bf5---11210499154.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/93809980225.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/312145036610.pdfIn PDF document text
    • http://sns.hu/_user/file/wovuvulogitesezefil.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/18538877209.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/83755633455.pdfIn PDF document text
    • https://keongracun.org/contents//files/5273763220.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/31146933429.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/73529055495.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/918ocv188veupi1c4mbpa8r7i7/74369915908.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b869f8416fa---gabonizit.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/17747201038.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/fdd57f5485d575f7fbbdfab0001ac020/52161174569.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/fireronudisana.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091de140a723---fisesuzedojilub.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/4b6ce2d76aebef8e19f42a40b56ff07a/89594904444.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/49888f4c58094a814a666a97e80abadb/moxitikanajaz.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/kimuwaririr.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+hunkyPDF 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_off0000cbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 19428 bytes
SHA-256: 4893f6cfef1631a64592bf184d0397312cd67cc31122a7bb4b2d80bc10e3a358
font_02_sfnt_off00011620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11620 10380 bytes
SHA-256: c1f54a842f3d8f63955b427eb4f22cf513a489a06cb3d0dd68d1cbb7e142be2d

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