Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9636ace1d87479d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 18:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf2244777cd3a190eeddb68b71371d2f SHA-1: 41081b5875f481044dca7bd9a5d314d7948ae5a6 SHA-256: e9636ace1d87479d5ca4f111e90bd750ba8e8d112690ae2606256f84dadc428e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common phishing tactic, to trick users into clicking embedded links. Multiple heuristics indicate the document is part of a link farm hosted on compromised WordPress sites, suggesting it directs users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=delivered+from+the+power+of+darkness+by+emmanuel+eni+pdf PDF link annotation
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecfd6057a24---30873353444.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/xituvu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/s1n717hd8e8s7q14ve266ltued/fazefefixadasedevuk.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9ea2d28d3e183b2aa204a4ad86228168/47022971646.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e415100d2b---bovogutapixizi.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/39207657079.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/5f8ea4b51357396f25f3298b7b024da4/nimogikobojemafizebid.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca63f053c9---93644132785.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8650391898---41498593176.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744eda2ed2e---80339697909.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/cf6d78a7e9e268e01738bbc795ef98a3/75149454823.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/pofelokozubu.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/65831361038.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/nogokedazuwofixofuso.pdfIn PDF document text
    • http://rc-modeller.se/images/file///32464343499.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/14338283225.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160708ebc8b295---xarakajerijuvenulu.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/30359625857.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/8etbedmfh902ha4q6r47demj09/81733675125.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fade3562c2---reboveripawesonejek.pdfIn PDF document text
    • http://metabolit.ru/files/file/73500612269.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/mosotigadigalawef.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/6221120220.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/3aef21630c3d88ae1dd52b9c275363dd/64460538090.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c6e66d3f13025f7c1c14459c96044867/tavipati.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_off0000b3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D3 14272 bytes
SHA-256: 005135fb16ebfc8b4508e8f5b034d5ade0e11993a83686a3680ccda40c1d5c7a
font_01_sfnt_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 11360 bytes
SHA-256: 8c77f84f05ef8a5831285ce3088d1b12485eea67c6f923ae11554de3974c4c84
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1