Malicious PDF — malware analysis report

Static analysis result for SHA-256 78555916f0e162c4…

MALICIOUS

PDF

80.7 KB Created: 2021-09-05 20:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 347b965fb57c88e6b8888645994c28b5 SHA-1: 7d32d3e120224e3f290ad5bd4128c71460a36de7 SHA-256: 78555916f0e162c464c6d76580123b0bb1889e0f90f63bb41f1892703ea79f45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for malicious PDFs. It also features a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 https://wastran.ru/uplcv?utm_term=discourse+analysis+for+language+teachers+mccarthy+pdf+download
    • https://doxity.ro/ckfinder/userfiles/files/tevazavebodufenelip.pdf
    • http://sangiorgioautoservizi.com/userfiles/files/jupuxubimidunixubazu.pdf
    • https://atputasbaze.lv/images/userfiles/files/kexolilifolibuxabon.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/03ovkv1dlcktgu68ti27gpspvf/97145121767.pdf
    • https://principesgs.com/userfiles/file/4096928381.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fc649a92---zujojibiwidogekaxebilabel.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rl1bb87ji7o221getedjqtr164/41222462838.pdf
    • http://ck-kutnahora.cz/gais/image/file/mevudanenenifemowujusa.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/15521490230.pdf
    • http://deurenhanger.nl/userfiles/file/nakeviviwogunojevaped.pdf
    • http://etasystem.net/userfiles/files/85091538966.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160e0d23cb720b---wudopexifogenagada.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1cf20beb1---mobipovezakev.pdf
    • http://chinasoftcore.com/userfiles/file///79218895783.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/30318854694.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/tifomazovuxezedolu.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/qeh705mpqgtc3nl8o83ahljrqo/38352382603.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/5191cba29199f7e4ed8b3e85ec43783b/89467717549.pdf
    • http://sosnovgeo.ru/userfiles/file/47379028383.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fe73ce49cef7779c4e99c37d4e5560ca/litizesemazamu.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/58202717571.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad37112e13---6347432711.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_off0000d549.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD549 16792 bytes
font_01_sfnt_off0000ed60.bin
e2c365dedec1a06481de077e784044f39481e09216b95db92ee16c64190b4dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xED60 11368 bytes
font_02_sfnt_off000107d5.bin
8c4744a25b3a34eec5316a0ab7281140b8621d017af9431ea38ceb93f225df6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x107D5 17208 bytes