Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc99a5f85052f77…

MALICIOUS

PDF

78.7 KB Created: 2021-07-05 11:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 37a0eda2dcc1e7ea6916e070df19c47e SHA-1: f71eee17a404fb7a0233e8f510a529e54bd441ed SHA-256: 1fc99a5f85052f77a264fd32296a82baf03fb6b8223cdebd9d21fac7bba84bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=wordscapes+cheat+level+1198
    • http://botosani.ro/img/uploads/file/9085638497.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ac5c35de8---26931869247.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tr256v163n4rebfrpa4k3cnvae/22473139324.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/tc8aaoe1ujvrbhjvfughk10goa/gewugobujulavog.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/895e0e5da34bb4ded0244f43b170684f/fiwodanilawerutori.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/fejulivumusiragiwulefefo.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d37c3dhj50b2kch2ii2dd0cdk1/janutunepuzexosebifilas.pdf
    • https://robertbah.si/files/file/gimatonelipudepozaf.pdf
    • http://viajesalaos.com/webroot/img/files/66056541956.pdf
    • http://ampletrekking.com/userfiles/file/58295545386.pdf
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607847a97053e---boloxudogafazenezuv.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b10eda6c5---93760262130.pdf
    • http://bsbcarpet.com/userfiles/file/kujuxigowokagezipenu.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cedbed89dcc---zunajawananu.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609dfc3513126---vonilavodisi.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4cece8d58f5bd7491f9294faebdbe5db/bineriwemuxas.pdf
    • https://masini-de-ambalat.ro/images/userfiles/zuxepigogerafogisekojuv.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1607a64d3b3551---towamovidewi.pdf
    • http://goldmustang.com/files/files/5929204519.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/45305ed71daeaa81f909caf170f388fa/fotapiv.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/57072gv88skc35n5gfl5hesf7d/zuwed.pdf
    • http://cerrutistudio.eu/userfiles/files/55614764207.pdf
    • http://ks4073.com/file_media/file_image/file/segotinugilopaj.pdf
    • http://area100impianti.it/userfiles/files/52682228227.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0095029a---gosixetevetewili.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_off0000cec3.bin
6e81993857d0403f1e75d51d3ee5295b89536d46d80abd577da188eb47e70426
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC3 16840 bytes
font_01_sfnt_off0000fa6c.bin
4171e4dc7c63aaaaad6e48d0940c8d4ba7d63ed7ac40da6d899beaed7c99cb70
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6C 10904 bytes
font_02_sfnt_off000113ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 16792 bytes