Malicious PDF — malware analysis report

Static analysis result for SHA-256 287a10a240423cbf…

MALICIOUS

PDF

66.7 KB Created: 2021-05-10 04:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858399567b18a7fc617f19bbf583a004 SHA-1: 79f438e7bbbd77e30f3fc6a3b1cb9e00740ce325 SHA-256: 287a10a240423cbf147180f4bad3414c7cc43ef7fbad0a8a34205e771b952497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=austria+visa+application+form+mumbai', are likely part of a social engineering lure, possibly related to visa applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9683

Heuristics 6

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://chcial.ru/uplcv?utm_term=austria+visa+application+form+mumbai
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6a621059---14555053982.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1c764c747ea9e3a012d1552a9617eecf/ravif.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f73332efcb---51741113748.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d2baa5ec2---tuwuvu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/08000728c011ffe4979ad456252285d0/jebuledidozolim.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ab2658ed9---xenemebelivemomadalevuduf.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb81fb7b5e---zukukumewetukosewedasi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e68d9b14d0384fe8a53960b724450ca6/60575319997.pdf
    • https://advance-pack.com/editor_upload/file/45916844748.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/b47f4ffaf807609495c74bac747518d2/wasekimuxixiwenaralu.pdf
    • https://cgeminfos.ma/upload/file/tozozawunedabe.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2f56e9371596a08da1fad740e03ed9a2/32264259914.pdf
    • http://ahkjt.com/upfile/file/73388343450.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/5b6ede11d6ad6334dbd7600df392837c/48077544656.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d38e.bin
472793158581aff497d61bd04f266b56342206663d4517f78dc4dacf7a7ab5f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD38E 5352 bytes
font_01_sfnt_off0000e5b2.bin
6b9f170fbe0552a17a4ad09263107d541e25d58a67f8c083097734f33327ded2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 11108 bytes

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