Malicious PDF — malware analysis report

Static analysis result for SHA-256 3315c4b1aa0cd2c5…

MALICIOUS

PDF

94.7 KB Created: 2021-06-26 02:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3eb1a51ed1a98fb10aa4c3012cea675f SHA-1: 8bb805a4bac47db9f2dba283f306c1fa56b5b90e SHA-256: 3315c4b1aa0cd2c52bec108b3a752abf8be805ae663f2c5c7ddb4dcde5d99fb2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The ClamAV detection and ML classifier further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=making+oatmeal+with+milk
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e27df985---51926294411.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/rs1hrpanav0ldb5e11pg7b9jbk/28783122192.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/bapowetonobikaf.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1f5cbd0d---dogekuxazas.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/696ad983fd15264318d1fb6fdb15e2cb/bijobibevasuzosuzaj.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a234b147948---6642041911.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f547891a---jowurotuwumuwimotamisokim.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c209770ffb0---jujepepojujidabufapukivo.pdf
    • http://bajajsports.com/userfiles/file/67405487812.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a32ca8c5---66923252694.pdf
    • https://bnovum.hu/downloads/38202385186.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/nrnj1ir7mh66gch3n5fvvqm6vp/gisifilopibuvusuzakafe.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077250fb70e7---xonuribotesapotimukuj.pdf
    • http://www.majbrno.cz/uploads/files/74857367313.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8cc1df91---11668613799.pdf
    • https://aprilboya.com/userfiles/file/jineboruteresepomepid.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160827229e0716---49863610860.pdf
    • https://scriptdd.com/_file/file/56340134595.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/19424461365.pdf
    • https://likeevent.it/writable/public/userfiles/file/9975357484.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f51e02c0ef9bbafcf4ac2dc98bb4ffe4/welezoduvigobomujix.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c228e83630---bobeposab.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6a4.bin
adfcf5244fd3763ddeed850c38c8bee79b27ad461ffbf3a09f19a4a64faf4f0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A4 10456 bytes
font_01_sfnt_off00010e32.bin
ceeb0f54b458d4aa162ad223c30cca0a1835f77a9c7840cd9104f2e3415d3bda
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 18444 bytes
font_02_sfnt_off00013ea6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA6 16792 bytes
font_03_sfnt_off000156b7.bin
5541a7b28c55acf05cfd803fee2288906a99fb79f9e03dce81eaae82880d911d
pdf-font-stream PDF embedded font (sfnt) at offset 0x156B7 16668 bytes