Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece8128b151c347a…

MALICIOUS

PDF

75.7 KB Created: 2021-09-25 20:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1e31ae98736aa4ee84eeab228aff791 SHA-1: 64eb255eb02743c4cc88f34c240cd97f665e7a21 SHA-256: ece8128b151c347acc90c14f8709d4217ba9f92ca80e3efd5865db7b49356fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://spzpoz-zdunskawola.pl/upload/file/49141748844.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/51fa17266ee43e29925bda619338eeb5/14670669228.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/54564572312.pdfIn PDF document text
    • http://domexpo.ru/up/file/48874079752.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c03693db79---45445058737.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/makewukut.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1632036458.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/31827699756.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/jelaxorunezumi.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/puwed.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/vododa.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/51142490647.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144112ee1c64---73415952115.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/74982233721.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/7102175141.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/32405928520.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/61142049031.pdfIn PDF document text
    • http://delta-serwis.pl/pliki/58909625512.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614140750ed1d---lukutafabobinubog.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///80767565823.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/kipireferuwedogetotomabe.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/sifamav.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/87166256900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=dual+sim+card+manager+apkPDF 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_off0000beef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 10832 bytes
SHA-256: f50cba6abdc6b9eec78d3992eca0e54abc5682ebc41c4fb44576a3b0184e1986
font_02_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 18472 bytes
SHA-256: 0bc67df2656cb01234abb0d9a657ccb0b162a34619e45d299c0b30772d1312ce