Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d11db38db0e9b34…

MALICIOUS

PDF

86.9 KB Created: 2021-08-10 09:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9ac11d36afc7b0a288e92a2c3fee4c5 SHA-1: aa71b21c3fccb7960b8b4c90ab7136e12532922b SHA-256: 5d11db38db0e9b341c44ae04b82e486297840340d6d1b0896c9b4819fc92364b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://archism.ru/uplcv?utm_term=what+is+a+recall+date+for+parole
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/nodedo.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e25d1583c8---73150915289.pdf
    • http://baggiez.net/userfiles/file/4228488371.pdf
    • https://norservis.com/files/files/juvibemajiliparedi.pdf
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/kagimopumevatefutuxu.pdf
    • http://kaztelcom.kz/ckfinder/userfiles/files/votudafur.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c199528f89c---vunap.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2bc6f563c57090fa32ab71c8d2e708a2/69284202790.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/6n7hhsvb81h99495cnos82urul/23182451383.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4ab1b24f9451e1c7d9423909ada73a67/28223726868.pdf
    • http://music-saikung.com/ckfinder/userfiles/files/kilabaw.pdf
    • http://thingsantiquesla.com/userfiles/files/11668584930.pdf
    • http://pospatrans.cz/UserFiles/File/kodutanafibi.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/b3b83c37e9788aa49551305749369bf4/sesisufutubif.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1a6dbec19---19936344930.pdf
    • http://libertyquad72.fr/userfiles/file/zulureroj.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/87986334680.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/tidegazilevidezerureki.pdf
    • http://mextro.de/upload/files/wuzodilulakozonex.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077103558a70---26005221938.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/4t5jtj3pino6k3tl2tq53uj7uc/68980907074.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70e07dc077---zobupatomasu.pdf
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wikaxukumu.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/5203709094.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_off0000f12b.bin
a57bd2d78630d8ead296daa157ca3149e6a0c92ff7ec639b8d2bb353ce4756a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16440 bytes
font_01_sfnt_off00011bb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
font_02_sfnt_off000133c7.bin
b5ba7937e5984cd3d75c794c2a3a82e8098de2e288405aacbfff12bd1fb85ad0
pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 10608 bytes