Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a56fe5bc8a118c1…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 01:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4d69897c175a136825c847fd7ab10b7 SHA-1: 66f829d38ff0d8f15eb650bddc41930db10b4cc2 SHA-256: 3a56fe5bc8a118c1ca099e241f707ab474118928879daa511af199be83d713d0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' parameters suggests a tracking or redirection mechanism.

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 https://nomylo.ru/uplcv?utm_term=how+to+know+if+you+break+your+ankle
    • http://polenes.cl/userfiles/file/76431696533.pdf
    • http://hzjksj.com/images/upload/File/62543830474.pdf
    • https://dcimx.com/files/kivuj.pdf
    • http://yingtailong.com/upload/file/211002174557959597g9a2g87chbg9.pdf
    • http://otpetye.com/images/shared/file/gutirikaxamixolatiwenugu.pdf
    • http://oris-am.com/editor_up/jaxituzomeva.pdf
    • https://alakharia.com/public_html/userfiles/file/fepubebixegujuwekomofura.pdf
    • http://good163.cn/Uploadfiles/files/zajijukigawodiluwodavoma.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a6a1c247---95875708024.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfa7c36d31---74829015347.pdf
    • http://adanamega.com/userfiles/file/kepovaxomij.pdf
    • http://kxqcgs.net/filespath/files/20211003050323.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614060e9cdd2d---21058597378.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd29d52bf---93597800154.pdf
    • https://behagi.eus/files/galeria/files/bekawokosorigam.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/97o30ovih1jt8g6pkpqj97iobd/betasakinoragepojaju.pdf
    • https://easy2ticket.com/upload/files/xigove.pdf
    • http://hpworld.hu/data/pic/Image/file/59390319912.pdf
    • http://21cedu.com/pds/userfiles/files/57039503176.pdf
    • http://zjleiou.com/images/upload/File/jobamoruxi.pdf
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/linitesegeluje.pdf
    • http://amuseonline.com/absite/userfiles/file/jorodifowo.pdf
    • http://alhambra.kopanramen.com/uploads/files/kuwoseradotobazajawuvugen.pdf
    • http://geoass.eu/userfiles/files/vijakugok.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CD 16792 bytes
font_01_sfnt_off0000cbe4.bin
0828a7451404335f3c72233520fdab57657cc32817bc66c90a88b3e3b502f712
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE4 10560 bytes
font_02_sfnt_off0000e423.bin
f8e87e3fed05c5d1e4d299b7c8965e074f0dbc3f784e27810fb250d352033778
pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 15592 bytes