Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bde3b769812c268…

MALICIOUS

PDF

94.5 KB Created: 2021-07-16 05:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91d03e98107ec2c5422b687791f950fa SHA-1: b831de8528c072548bee908b7a64b80c167e4162 SHA-256: 4bde3b769812c2689247be8f52a4c05c3eaa54086f1e714f60eac04e0770f013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were extracted, the presence of numerous links suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://omak1968.com/clients/71178/File/fabizisigufaxupamapi.pdf In PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2de1e04894---gilejozofigi.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/fukat.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/25562542825.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096812e097c5---21653741928.pdfIn PDF document text
    • https://shopabrang.com/images/files/59698241246.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/11394bc2c532beda25aefd07ce58e727/mejufofesetiruruxixener.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b3feb6896---wabosuketi.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/79203830789.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8ed95c41199b761ae67a99004d66aaf4/14867114023.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/8269712586.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/60884141975.pdfIn PDF document text
    • https://digiconelectronics.com/media/9599460732.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf253f425---12696185680.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/neruvoj.pdfIn PDF document text
    • http://envigest.cz/upload/file/45050930095.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/dikevoxusokona.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/12a4m9nor2f1spumgapjb3dqa1/6537121976.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe2d9a6a84---38804028582.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/tavetava.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a8e500945f83f7d3a03379a88d5c94e0/27036302452.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b42cd571edd---64090079717.pdfIn PDF document text
    • https://www.naturartshop.com//ckfinder/userfiles/files/jaxaxu.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d4edd6876---gupogitalegawidej.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/4967158978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=recommendation+letter+for+postdoctoral+position+samplePDF 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_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 16800 bytes
SHA-256: 4c1b524a5b49731a2246caf6fbfffd39eb5e601835f8f309cc39fda8c0a8a39c
font_01_sfnt_off00013b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0E 10824 bytes
SHA-256: ff06b671ee104a40de1a3752b81401c97aa393938f2603d5f254975facf2b70b
font_02_sfnt_off000153fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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