Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf76bb6a98d77f1…

MALICIOUS

PDF

78.5 KB Created: 2021-07-21 17:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e3ccee913fcace0ec97f05fa56dc10b7 SHA-1: afe3319cd4dab1ee1a1f5497aee340e0ba13510b SHA-256: aaf76bb6a98d77f1b0d25c9e52f2a44b27f244d9ba3d8e121b83c45f99a98880
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://alakharia.com/public_html/userfiles/file/rojapugor.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b419cdd2---89630219823.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/wegivim.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/vomanirizasexiwoki.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/vodutifazakorudava.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/remagiduziniradogudijujev.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/nedafebez.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee56b58a850---kofilalemojaka.pdfIn PDF document text
    • http://goneviaggi.com/themes/userfiles//files/dizawakemuluputi.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f2f40c06---64187218823.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/rerolurijetopedopigoji.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608221caac127---dovewofixive.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160acb8aeed9d7---23951708623.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71448ce612---81611378411.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97411639ef---josabezoredu.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/34989539804.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e09766785b---xasokesigubimuvosagibipug.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd68af05c71---95421043134.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/51714314264.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/27202090684.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/wedidufijoma.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc78a89940---derifuxirali.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/27302830461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=i+want+to+sleep+in+spanishPDF 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_off0000d04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85F 17528 bytes
SHA-256: fa965419189c30b033321edbe4479bf03f420a522d3637aef707c517047a632e
font_02_sfnt_off0001154d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154D 10288 bytes
SHA-256: ec19b71282a58b56830ea6377a52e7d6d55a9d40c3be95ca4e6306b57aa6e0c9