Malicious PDF — malware analysis report

Static analysis result for SHA-256 120b5e4dec95b2e4…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 02:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea9b31c895a6ec83604c7c55620a3e28 SHA-1: 8bf68112283f6e9b5a95d7cedd7f447972caed2b SHA-256: 120b5e4dec95b2e46a368bdf0e9307672e24bedf75a85a6cea7b32fb851857d2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites, indicating a likely phishing or malware distribution attempt. The heuristic 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' strongly suggest malicious intent. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wu-pao.com/upfiles/editor/files/86733940352.pdf
    • http://upasamed.org/Content/uploads/files/kusokoguwexebixej.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/23089605349.pdf
    • http://scantech3d.com/files/vokedaxakonurege.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce0b13fbe6---34258052809.pdf
    • http://munnarteabungalows.com/userfiles/file/lopovunenuka.pdf
    • https://bda.ch/ckfinder/userfiles/files/zodimegix.pdf
    • http://firegallery.ru/img/upload/razaganebezesuz.pdf
    • https://gemma.lucien-sv.info/uploads/files/613426450ec8c.pdf
    • https://khangle.vn/uploads/images/files/sedabusudef.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/jaxojulipalomazaravinun.pdf
    • https://krusomying.com/data/file/19269147600.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/snfcqph40eslgeh8246ru17q9m/lititozofapatotelexoler.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9952c928d82b272cfc360f1070878705/40777640670.pdf
    • http://champagne-marc-chauvet.com/images/files/46905803488.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/84818215790.pdf
    • https://nabsangram.com/userfiles/file/41176127003.pdf
    • https://korankertas.com/contents/files/pajeravojovute.pdf
    • http://thumpamonpally.com/userfiles/file/diponog.pdf
    • http://ikra-ekb.ru/files/fckeditor/file/774269370.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/95200649585.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383324206d5---26847246319.pdf
    • https://ostrichtours.com/ckfinder/userfiles/files/95337719725.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613286ec86bc0---85665816384.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=install+android+on+pc+without+windows
    • 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_off0000cba3.bin
550a0b22886155c51c01c516652a0239ecde55392aea0341052e1ab486f59bdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA3 18736 bytes
font_01_sfnt_off0000fc44.bin
543e4b322d7e223c9c50248987b0c89bb64b4d40793b3031683f2e34aedc4f1b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 10616 bytes
font_02_sfnt_off0001147e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 16792 bytes