Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa15ff0c9551a30f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 10:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b41f1121402a346524922377aca79db SHA-1: 19dc1238272db86eadd2d423c2ffa2eba10b4e61 SHA-256: aa15ff0c9551a30f61b2d2e16c500c5e32f775b1c4e09fc5d169c81eecfaae7b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nissanotogovap.vn/uploads/images/files/waxibetavedu.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f085edef6---65796229210.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/kajokabezi.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/64ce64062262e7b435fce30449609c77/91821989516.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/10345755911.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/83890578984.pdfIn PDF document text
    • http://gewald.ru/content/Files/88299203195.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/2901202830.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/degarom.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/xijonigebavu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebc8c7c24d---27970424552.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613530671a36f---31118502675.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/40862121169.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d563606324---kovewosotuvirevam.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/97818791412.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78710142468.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/43245231488.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/duduwotosusajaf.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/nefoderekemazozaguvuwoto.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/94797129340.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-1/20210901110259432120.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/41923335075.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/38755895909.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/notazexemerowiji.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7vma6slr5fsq7tlt8og69smtc1/xizomawirogapa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dnd+5th+edition+character+creatorPDF 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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 10388 bytes
SHA-256: c32cdc06135faa2c4c22be66492f7550303220d7caed9f83ded1ed9ca3a1efc0
font_02_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 18160 bytes
SHA-256: 6b1972d29ce875b06fb841971ebb65b50db11d4a78524f46bc45af7cdd11d3a2