Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a4690679cea01bb…

MALICIOUS

PDF

94.2 KB Created: 2021-08-14 03:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac09445554cff3e64cddaf4875884488 SHA-1: bb45c20a3721278a9a9d03c15f6970b46f015f7e SHA-256: 9a4690679cea01bb810a4aa09f60bffdf7caaa89a17aaf1199f7256e7b2ab37d
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vibanghanoi.com/uploads/files/94999263968.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/19340212096.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tedofaru.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0384592d---93274204366.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/jobakoxozimixila.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/82743109388.pdfIn PDF document text
    • https://hssanesteban.cl/files/joluvisijedi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/d379bfa7691bbbaa76ca4ddf0e32dd7d/18245828905.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/tefigetojeg.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/28494991525.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948484c990e---zabujilupegiveravi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b167c20dbec---84014224646.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607749fc17fc2---xolasagatamipejomorizibej.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/gesonepokatozabefa.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/78408090482.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb5d750654---megexatupafapopizajila.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/41813289857.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a538c002b56---kenogonidaxipojapiworogu.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/70481652206.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/28444954504.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/12079296644.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2107070222028812966pv9gs.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/87573208167.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/fitawejawurun.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/s2gp2pdco68gccjvvje95k762s/63972796565.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/ponadumubex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+twilight+saga+eclipse+full+movie+in+hindi+download+720p+worldfree4uPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 11652 bytes
SHA-256: cd61d1753c0be254070d7644c2c7f0e0cdd0ac6c1c3a73192a635c7187317d24
font_01_sfnt_off000109e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E3 18220 bytes
SHA-256: f1a87cd8175b1ab0505eac6330ca7efc6b732606a2c39f82983e38efebabe397
font_02_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000151cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151CB 16116 bytes
SHA-256: 74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084

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