Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd64e3675f4a877…

MALICIOUS

PDF

97.5 KB Created: 2021-06-07 02:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d3b68ec871709d7114d353fc16ea574e SHA-1: 5bd41cfcf96cc6737465c6c43c0dbaace16cd4fa SHA-256: ffd64e3675f4a877a9c871ce60fb602480e2a1cce5d109ac6185f5c85faf788c
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. These URLs are likely used to host phishing content or redirect users to malicious sites, aligning with a link farm or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://archism.ru/uplcv?utm_term=zabbix+icmp+ping+simple+check PDF link annotation
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/6b72e5b567dd2f8b84564d7f3e731d73/sibazozemataf.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b25acbb6e4d---13037631214.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/zomoj.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/10aea01803f240e9c3cb7a5522805965/93742857916.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/bb221059693c5ddf457f668d158347ba/gojalo.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/7hjs2ih8h3pnjd1q81f5ngn162/badifokaberevukewekopu.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/3d6d12bdf459aa0de4c608e3578694f1/22247574544.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/911388cf5d86c0589b60565c5486b6cb/xifupe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ndm0kql76vh7ei5uv4egcuckv8/vowigadijajezepi.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc835d28f---wupofazazeginikawoxije.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/79352d94edbc3e767729338d9e555ca4/mobejefefunaronikojepeso.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18f881f9f---59167313721.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16073f513c76bd---32690019539.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/waxotutegifijawaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD456 34000 bytes
SHA-256: 4d5ddb254ea2335a72e28dad97ee8d6d741da0b59137bc59fd864f7571f1f504
font_01_sfnt_off00013ccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCF 5480 bytes
SHA-256: bdb066842da741c4835c89909c81d051c799ff0083cc1a924f1ea54f59e07831
font_02_sfnt_off00014f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F53 11724 bytes
SHA-256: 74b27782077cc180cb242676b8ffc31bc6f39e3ab8e0d625363df247c0adcbdb