Malicious PDF — malware analysis report

Static analysis result for SHA-256 cef19881a635ca8b…

MALICIOUS

PDF

78.2 KB Created: 2021-09-03 03:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b35b8698b2142b8cd0149881822ce50c SHA-1: bb414c2788f74fa26938a1b60286946baa913da5 SHA-256: cef19881a635ca8ba95e0b4a18b8bdbb37d056a2b5fbd441d130fc2a33d0ce53
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/cjp5p3pqlhr0h5glf0k3ruenc2/43322690949.pdf In PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49b80ea18---venubukafafunuk.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/71583666262.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f02087aa8b846f7577c2bfd6877e2351/23012076855.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/89888593421.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071347f5d9e2---mimeboka.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/39735462488.pdfIn PDF document text
    • http://innersolutions-uk.com/file/jezirexeguxumud.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/laxogezetuvuzolune.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/28362792235.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/pexanukimenikatowofa.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/73021090775.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0835ed7e6---sesutexa.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/sujux.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a6450116d3e7e3afa1dc8d5d27b96258/86047317800.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be671572e8f---fajozarerobipizeta.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ed48cee421053d397cd2f42deb150ba/panokarinipowid.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/5obeiorabeloh2r5001esenttm/fevilakemamijapawilomiw.pdfIn PDF document text
    • https://kueapem.com/contents//files/39659064678.pdfIn PDF document text
    • http://ri-rm.ru/userfiles/file/wajimazuxi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e336ef64---79670391146.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/43237223456.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/tufutibusaxebakalin.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/vudadexadasutifamon.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/72459358168.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/lujitomez.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/28396751876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ge+spacemaker+2+microwave+manualPDF 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_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 18224 bytes
SHA-256: d1ebdc0eb16e6ced204851e411e53dca8786feb5db8c9b9067b4dcf12ebe1a64
font_01_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 10940 bytes
SHA-256: 3ccc4601e7a549ea9f3de89b7d40fcccd3e23a501e85e477310de80596bd8134