Malicious PDF — malware analysis report

Static analysis result for SHA-256 88ef8710475cd522…

MALICIOUS

PDF

80.9 KB Created: 2021-07-02 10:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6a85c6eb99801da88e3cb575afa73f74 SHA-1: 674648ff784fddad8e773c297b602a7b934232b0 SHA-256: 88ef8710475cd522445efb48e895e65cc3fc751020e7bf6d9c57f348014a32b9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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://nomylo.ru/uplcv?utm_term=the+least+coefficient+of+friction+for+an+inclined+plane PDF link annotation
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/58688243782.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vukozunaduvava.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/j8ifns7rbjmdqs6oi8e40h05bt/satowenogudu.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa34037325---76168913076.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/zesok.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4bftvjm44qiq19qc45tkr509on/51231055416.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d2e9a4a17---80844768001.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/nagilowevigalatavipofofe.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/71523406954.pdfIn PDF document text
    • http://www.buildingmalawi.com/images/uploaded/documents/nudagiwubo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a833e6286978c8f1ef83ee143a8d7493/55945378873.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/wovisasosafobexomibumup.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/43pdvggj39p1tuk1731dcj2pv8/pirukonadog.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zedefatexok.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/74a31c27a384b7d4cee95d576168cea2/bokikegolejon.pdfIn PDF document text
    • http://ecole.ru/text/images/file/wutubiku.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/2500889705.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/8358779310.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e0ceb060---fajonoxe.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/ee4bde3ac45efe7d6da41dd1a948fabb/xazenewuxaxezowukisovunog.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/d54106f1ef02b99a243527f3c5d3b51b/guvupibufev.pdfIn 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_off0000d651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 10680 bytes
SHA-256: d86cbc6b0d0993af1abc3232dbdb89de6c22f5cd3fab515d17388dba507c7be4
font_01_sfnt_off0000eebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 17444 bytes
SHA-256: b92dcae1d9134ea77a0bb636f64f81c9e4d28fbe43bac7115546d984c056b09d

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