Malicious PDF — malware analysis report

Static analysis result for SHA-256 453f1907fc6ebebe…

MALICIOUS

PDF

114.8 KB Created: 2021-07-27 09:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: cb7e580fee2268abb7de1a80932a8ee7 SHA-1: b6365f5d9c10967135c360b2c3959a8782396869 SHA-256: 453f1907fc6ebebe745de269a8842dbb9e29d49b0d705e7b3ff41c63b1ae37e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://ecowaytechnologies.com/ckfinder/userfiles/files/23481718607.pdf In PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2f97df9f4---lapeluj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/4hb6f0plgg4vvj1ihl44vmu7b4/16821777666.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cd280b412---rovudolago.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7e5bdcef1c0e644c0f60d1ddbc966e28/mekasetasoxabe.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/67071650563.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4u9qdsrvq3e1n3deu4lpg6gpm6/tatiwitakejedawuxofawaj.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/67895258953.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/62143469617.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xusolobazorazeganegogeruv.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/uksm23q6o5dg1u7jdft4hk3fae/84933096920.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5d211e9518c7ab5a9f1b8de5cf0564b/41397514003.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/kukewamemerejoderapiwoge.pdfIn PDF document text
    • https://noddy.nu/images/file/77696285888.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/jagodusuwoni.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/77893015879.pdfIn PDF document text
    • http://sochistandart.com/ckfinder/userfiles/files/77002688470.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/90476993186.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/lidajubulaluzosivobazumo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e605d06845---kefemuxalulo.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/wafovipujoperenadal.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/rijevedebowodelew.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/pfe7n5383023d8ntf9e7pvpgs8/90942624469.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rn82jq86t6euh048s4lbig36qc/minowume.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what%27s+the+difference+between+prepaid+income+and+accrued+incomePDF 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_off00015e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E3F 11192 bytes
SHA-256: 70a82a9ddcce53ee3c8b0f37bbc1f2cf1aa0e0d3c4227d600b4723ea730c1f16
font_01_sfnt_off00017820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17820 16832 bytes
SHA-256: 125793613abe7fbd21e5b24fd710503291d78c2efea8e0c3618ea5b078d235ec
font_02_sfnt_off0001a434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1