Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6ae8cbe0fe96dec…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 23:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1badb26fa76bf2bb81e2eb0045f1ad0c SHA-1: 23aa9ac2d9c7119e2f488a3870d92c7eaf6546ea SHA-256: e6ae8cbe0fe96dec28b368377930cfb6c261dbb6a37dcd93760a631422c2f7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://philabc.ru/uplcv?utm_term=oreck+xl+air+purifier+user+manual PDF link annotation
    • http://bassbasement.org/userfiles/file/38416218735.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d4cae7d361a5e9f9101fa926c41dc9e6/pogukuwe.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086bea86b9af---61722876315.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad953236e0---sorono.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/69184758771.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/29619891478.pdfIn PDF document text
    • https://artbynela.com/uploads/file/12160711713.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/35055062999.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/gesudulamuzogekajuroruda.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161178abd04008---11782128882.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/1s4q50p8abracvf6thk6s14a48/lulizanitolumaw.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b8a319e5e---pelodonajosarofewedubu.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/dipoparexanupaba.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/buneg.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/kexetoguxuga.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160982c437cc74---87571335142.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/23654354582.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/99298250126.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e20520f539---pokoxanunebituzasu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/fabf5c00de0f0f442109e1f76d67cf19/37618395035.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1b0a9aad9753fcb05ce0e29822f55114/56187994379.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/54478035373.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a793bb8869---21103745905.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/30943665050.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/59412975383.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/76a31dddde23e34160d6dd47de8f57b9/59351132672.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/424a5f783dcb22ee4d0e360db4b84bc3/15118889531.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_off0000c3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A8 17180 bytes
SHA-256: dec9deecf9a29525779f3952ed838238ae55e1ecbeb69e57dd0c97ef73bcda84
font_01_sfnt_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 10740 bytes
SHA-256: 9df37bdf1d499fd78661ecca3f26acf0992191df230dd8af222fb48c1961c687

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