Malicious PDF — malware analysis report

Static analysis result for SHA-256 8181e8efa6d80753…

MALICIOUS

PDF

88.5 KB Created: 2021-07-22 15:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 712c1b80a5426003f507caa69c998da1 SHA-1: adb339e8b5d7bf1aa4fca0b683ee5f0b62e48ec2 SHA-256: 8181e8efa6d8075358343a8d0faf3b8ffa221a10998ef0f0d30b41b3ffd4a196
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://besttailor.info/ckfinder/userfiles/files/ziravoxametekajidalu.pdf
    • http://allaboutdowney.com/userimages/joletevarekegodarowilo.pdf
    • https://eminencesolutions.in/resources/userfiles/file/dinobigulowofaku.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/dkkuatcpoah7bvig22iku5ojd6/12329274099.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/9hhaae3ivk87p7t8ofbd55n366/zasan.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/4949abffffb6c4418ef4a7fc78d64b53/69128227209.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/40693569205.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/15586687148.pdf
    • http://romanakladatelstvi.cz/userfiles/file/36437606385.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160872871851d3---vegisanewo.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gernpgab9c5sh6lj21o507mcft/26355741910.pdf
    • http://tubietelbar.hu/uploadfile/9493321174.pdf
    • https://horizontire.com/userfiles/file/lovufepuwok.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c288a9c9bfd7683f8ab84c3374206c7c/lidotutumizomopixukifokax.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7c0a25742e353c71cc40d7b165ea47a1/59640699360.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a4e2a60c---68750445313.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae534c666f9---4179172866.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/jinamiruf.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/87764352347.pdf
    • https://www.tamilsaga.com/ckfinder/userfiles/files/39704748594.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/751bf898e67d8aadd14b643986dd915f/43516294113.pdf
    • http://rambud.pl/uploaded/file/2878365657.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0bbf5e472---76175691510.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/c8d23447436be42b0e3d276daef242c4/86912486449.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607814296ddab---kapidaxuper.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=guidelines+for+the+administration+of+drugs+through+enteral+feeding+tubes
    • 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_off0000f5b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16792 bytes
font_01_sfnt_off00010dd0.bin
f00dace860471aa37b8ecf06753b3da41773a0795e22d713c57a925224ef0466
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 11080 bytes
font_02_sfnt_off0001273c.bin
0db748f077bd56bde5563e9f3d9f3612b8bc07e05c823b670a76385f6decb9dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1273C 16976 bytes