Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc7a5e5396fac42…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 10:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 22fdad863f47a719d96c559c3970f812 SHA-1: 00b5977a3eaa9cdb45a498187347611877cbc77c SHA-256: 7fc7a5e5396fac424a10c9984e1e62f0baaafbac63028ce7c6ef347331a4d935
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous links suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://evo-models.com/uploads/userfiles/files/memijuwibovanexiriroxeki.pdf In PDF document text
    • http://smeeing.com/userfiles/files/14776809327.pdfIn PDF document text
    • http://ippon.lv/uploads/File/bijuxawesalexov.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/33477464197.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/sevesu.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/nofepulisud.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/46210000975.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/wamebajarerefosukuro.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/takudopopezudelobi.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/fixovitub.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614573bf80fa5---jamoluxinonusavowewaburej.pdfIn PDF document text
    • https://netpage.info/userfiles/file/remevedexupogafefuwog.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/pujanawon.pdfIn PDF document text
    • http://josquin-capella.de/download/12499386646.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2bfd9bebe42a520201224865c8f2b93d/44797217617.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/28377019549.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/zufinanenebo.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/11345815634.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gokevu.pdfIn PDF document text
    • http://change4best.ru/upload/file/jogupaxufipuledomefopiz.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b68e85cad8---sagenunu.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/45611156810.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d8ef5d4fb---33836560488.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/musadedufuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=live+cricket+tv+hd+apk+1.2+3PDF 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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 10700 bytes
SHA-256: 6a9e7cdafeef55ea564b1e95b13d0981e9bd6d1346e0e987b5dfc64c86de38fa
font_01_sfnt_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 15064 bytes
SHA-256: ae83fbb731591ed21ceff5db3204f5162712326ea2133128f21448208018df1b
font_02_sfnt_off0000efc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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