Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa909aa5ba9c1786…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 21:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cfc89f4a77a71383f47f3f92cd6a2db2 SHA-1: 326f3339cd0362521a700f1a007076b02a9fb596 SHA-256: aa909aa5ba9c178697c0446eff90403e9cb391da5ff9098386924e45aa42dd8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://lovesenergy.com/file/27197173023.pdf In PDF document text
    • http://seghers.kr/data/editor/file/16884009226152ca343709f.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/fiputusosuju.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/jewukitaduf.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f345171e1b---42594641271.pdfIn PDF document text
    • http://tayles.com/uploaded/notizojir.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210908063134.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109270712221487.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/kenolexomaroxabe.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/773cb0f6187d1cf6d8339f06bf733482/diwijelawegidug.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/gexixaxebubazuguwavifut.pdfIn PDF document text
    • http://haai.org/upload/file/gimaderafukinelanigizure.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/lopawivegex.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/77656575652.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0451268001630670193.pdfIn PDF document text
    • http://miminku2.com/contents/files/39614695576.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/numine.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e42dbde4b2---80960131311.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/77261266595.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/fidevetepewi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614b279dc1b0b---lodikejufitenefi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf45dc73c1---55159433039.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109130909328424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=grey+book+pdf+downloadPDF 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_off0000b000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB000 10604 bytes
SHA-256: 8ed7eecf4c26245dcfa0ae7bc557ee9be98aa8cf8dd85c4d1a3d0c505e81e70e
font_01_sfnt_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 14668 bytes
SHA-256: 58cc1c27b93ba2cac993840ed8b07429e14d30416dd2a448b1ac1f41f7d53ea9
font_02_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1