Malicious PDF — malware analysis report

Static analysis result for SHA-256 4192e3910de476bb…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 06:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90db00644ccbf585062ff4fd427618ca SHA-1: f7afef229b938ad93c087d734724507a8c404dd3 SHA-256: 4192e3910de476bb29f4ac827d6bf70c8f55c52e28ec385a1cad3eaf1904b407
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://philabc.ru/uplcv?utm_term=how+to+change+font+in+all+powerpoint+slides+at+once PDF link annotation
    • http://svazekobciorlice.cz/userfiles/file/pasibutemixubaza.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/7247215992.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/68066117880.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/21441561691.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/77774738545.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/tirigazeredipazomojav.pdfIn PDF document text
    • http://art-ball.net/files/file/33114300693.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/51271932065.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/17371344065.pdfIn PDF document text
    • https://o-dance.com/upload/files/61381032790.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ace4cdb54b45d7f4548f91659527435e/12318870626.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/k81jacrssnkqq7h1tvptam6iln/48050909541.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e82224e97003b6ee8975c20584385a87/rodewowefulugidufagunatud.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/luzefajazuwu.pdfIn PDF document text
    • https://akemi.ro/hirek/file/vevezuta.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ec2e6b82---83259378546.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/jeveposojexotej.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/7f677519936e75f521af4018cc9c4ce1/75239561146.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/juzosimazuwufifadavetexar.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbc61d716---79530315243.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/d246e87762de887cff74f89ff4e8ef5e/51979903850.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/33076995784.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/zifivenom.pdfIn PDF document text
    • http://www.fotolia.com'&gtIn PDF document text
    • http://www.fotolia.comIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA5 17884 bytes
SHA-256: a3bcddf6fb492ddbfa64e4cd0e536ec7f847b297ac1000908f3b5b1ca53efacf
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10976 bytes
SHA-256: ef6dcf1553afda1084ed7cc28e4a9a99dc9f07dbea0fb9db5599ab9ed87a7dc9
font_02_sfnt_off00011377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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