Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a8a360ac4c2bc4…

MALICIOUS

PDF

81.5 KB Created: 2021-07-02 03:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 369ee8794a5bd5e8e321af4d85a54e46 SHA-1: 08c641e4e7c09ccbc8720116b53b9526226b4115 SHA-256: 08a8a360ac4c2bc49b20c450f830a480911b7e004e314bc10044e2d580a98703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be directing users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=cool+names+for+purple
    • https://botorka.ro/userfiles/file/sawanofonava.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/mafivo.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/u468os6sleqvfvhpjq6gtagvph/70797805905.pdf
    • http://changrung.com/ckfinder/userfiles/files/16172550299.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/deaed182ff95bd189acd0627bf5c104b/gezitesuxi.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/ne0l1jqp2rpqa0bi2cgf3kq1cg/3775460226.pdf
    • http://bhs-class1957.com/clients/35434/File/64769171053.pdf
    • http://mxagproducts.com/upload/browse/file/22633666839.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4917b462---bejevoxorejiw.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/58cd1f7d1129c8bcc0e5856441dabf12/1149567282.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b06f8f9a93c---5864792828.pdf
    • http://thanhlapcongtykiengiang.com/upload/ck/files/43406818895.pdf
    • https://fullgame.hu/uploads/files/47326689742.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d251c31673b---55758567278.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/961bc260256ae08e066cb4695be3fef8/rufovunikewakibumosarub.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/eb7e0oc1thadjbmg3ejodmjnb9/38508522048.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/49d98adc85dd74309cea7672d06dbd2a/99909923813.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/79161314896.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3c5f15f40---vidujunizupujiwofolog.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a146e7de980---dovikimexefafewilirojizu.pdf
    • http://originalcheck.it/public/img_admin/file///98305116783.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/qgkj4nqkg4sag8doircs8h4cd6/18801672203.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_off0000dcb5.bin
79c331b3c568309be1d1b010df439f373dbdeb93459d74f6bde1c502d4895610
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 10460 bytes
font_01_sfnt_off0000f478.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 16792 bytes
font_02_sfnt_off00010c8a.bin
44234fe0b6ca50fa07867a27acc29460a435d79b62453fae9def3fe42b47097c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8A 16984 bytes