Malicious PDF — malware analysis report

Static analysis result for SHA-256 4107409e2787a027…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 06:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 282114d43c788e3eebc0e9a780aa3bed SHA-1: 13c4e029bfd36e87ff387ebecdc8db5583acef87 SHA-256: 4107409e2787a027b171e068a939229fda82214843428d061697468ae5b7618a
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest an attempt to lure users to external resources for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://cheers-gifts.com/userfiles/70219044714.pdf In PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/49686496742.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/4a426d2055dc006a00fd377d84c43a52/95175330492.pdfIn PDF document text
    • https://ikima.fr/uploads/file/89660411239.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/82744328268605d8bd2a778091c8e3e9/53231522491.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/fagurivavitiwuvulu.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jukuvuximesuwalomawuwub.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d10ba052---bamabekekafif.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc498c924c---16870711459.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/35624377269.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701e174ef1e---10204086164.pdfIn PDF document text
    • https://ixiu-23.com/uploads//files/202108102242468980.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/gakagofedujigapoguwijij.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160876eedb7dee---ruminanivezizozekexu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8af818db4c2c8294c0f456a510d81060/87209294063.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/xajivupolamipataduk.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ac916e85---gukabogodakutodo.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/janiw.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/lalifagatasu.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/66380978632.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/tijikeluguj.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c4a6f69650ee95b247f8cd48360a9d0d/tagovusi.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/durop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dark+net+deep+web+browser+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 10564 bytes
SHA-256: 587596174a33e7eb4f292d2c1e54e0a6fa3b28e9b4fbc93081be3e53431da4bc
font_01_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243B 17620 bytes
SHA-256: e53125a2f4be9bc1e3570852b4adc941030a74cc96c9515e840e200a2e195769

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