Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e8d7e87fac0c6a3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 13:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d0985b477d0eabb0b1a387f9fd4bad3a SHA-1: 0f065da0a0b5a755761e6683acf2c6735cc19f50 SHA-256: 2e8d7e87fac0c6a3049100e8693369692ee5e930492f89659697048643ffbb9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to websites hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://adsbudget.net/userfiles/file/jasizipukunamosun.pdf In PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d8127c66d25023786a4a0c3e8b9170a4/29047671523.pdfIn PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/sifamudifuxazasekenonib.pdfIn PDF document text
    • https://teamcode.net/upload/files/34644323584.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/7729430108.pdfIn PDF document text
    • http://scoopsites.net/userfiles/file/bebubuniw.pdfIn PDF document text
    • http://viorina-deko.com/images/file/besuwavexijazifutukipa.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba63409f222---kopeduporavetobajo.pdfIn PDF document text
    • http://budka39.ru/files/rawasifonunofugixipif.pdfIn PDF document text
    • http://sissonne.hu/editor_up/pazavumepimoladimef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9be3e89c57---56458302671.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/3bd4tnbjahoc4k775563b97evv/26258069492.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/84141747815.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/007eeaf62bddaaf0b40aeeebc7bffa8b/24898258511.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2e937324ca85025254e12d9516deddf7/5047801059.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acd13851cad---65286151991.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/39575570832.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/0401bf640a8671ace410ccc151810666/zibawajibewepopuduken.pdfIn PDF document text
    • http://aa-nusd.jp/biragabor.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/65043011580.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/71211020985.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4426e3f26218cba7aeb818c53641f9ec/2271887227.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///19108932823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=honda+accord+2008+repair+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_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 17004 bytes
SHA-256: d20ce8d9cabd1c4cb4ba795f25e2b37e182d1bf4cd8459cd98cdc563167354b0
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 10952 bytes
SHA-256: 525ef2011154416d3070315e56e0d456e252a918c02dbd6c6a7be623a6f8548f
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1