Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4937499f889e73f…

MALICIOUS

PDF

88.3 KB Created: 2021-07-21 15:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 378b2734da6b5e74377b5a852d36f921 SHA-1: 108552afb999ba3b50c11ee6fb506c303d9fa829 SHA-256: d4937499f889e73fa7ce15788a6a7b39a9ad923c480b221e63d8cfcf7f23ce6d
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO spamming operation. The PDF structure and embedded links are consistent with attempts to lure users to malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cokhixnktientien.com/Images_upload/files/zevevalobake.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/cfpj7cddsogg3sde5uechiisql/45126258549.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f87b1ecab---27630182265.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tajosa.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/duramigud.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/zuvobobitegete.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080360047636---pupubipitosas.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/56197970354.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/63813832170.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f69fdee6f9d203840fe6e52f88c8181c/povetelofitazegage.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/21f17307cf69b953ce6eccdcfd44326c/6580839694.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/060190c0382755a49a644ceb7349de2e/25874725304.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79e959b25---79575264697.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/22921926117.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076912060cb0---66727125584.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c99d364e---18398315747.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xusomitexisem.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bac44ed97c0---98113700470.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/85801535665.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92173336490.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/q2i3hudvho8h7e6iqam3ack59d/80089255023.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3127204d0---fudavukovoxumapoxajagos.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jfmt2purjehojk9fkruilhmka7/34862275789.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/bekarixiletaxemi.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/78194471018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=astigmatism+in+toddlersPDF 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_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 10572 bytes
SHA-256: 440ab7bd7d66b29d02986479215e0c20fc30f687a1dd0434edfc6e556efad561
font_01_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DF 16760 bytes
SHA-256: 43b4dc25c5eaa3fcd4d47d3fe567abb2c15842e1b15e089b59e824e6a0314d59

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