Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc5a6a616dbc07c…

MALICIOUS

PDF

95.0 KB Created: 2021-06-26 15:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b045c1915e12149a748c1007a84f9fc1 SHA-1: 738365a80bbbc8e931d82912cc9b3d5ace0ebcf0 SHA-256: 8cc5a6a616dbc07ccfb004687ad87ac8daace19a4015e5f279977aafff764e28
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicative of a link farm used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities or tricking users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=stop+market+sell+order+example PDF link annotation
    • http://bagumul.com/file_upload/spaw_upload/file/20210614175752.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/db5051d128f433231b5370fe6ac8fcc0/5781874766.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/96402576166.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041a7c0f67---wexogoko.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/530f71ce102dac13a3009b8915547282/92600807601.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b499d66f94051bf3872c75a9e2000944/tosunabakolixesu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/464db158dc3399771132dfdf1190cce3/89329124526.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e6d22998ff07afd2991559000262d4f0/pumelixuw.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/7744163656.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/61706505570.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jhqhkqglre78b91him7tcha7hn/10094682003.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/365df66e552d93ea0b7a6404035c5770/49466343766.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9eafe488b---85532018618.pdfIn PDF document text
    • http://camping-du-lac-dijon.com/fichiers/38389432860.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/zewovexidamorideve.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/jnunukra20nle4vhjc28eco6i7/78150245021.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab555b555---xeduguwurafamewidanodi.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/km7q5h5fvas91itpj0bmh41tm6/52405621248.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/94835464871.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/31615280931.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/61490381954.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/84100990874.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_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 10624 bytes
SHA-256: ba1724926dea6c47052f0a7fb4a20d98447f2cf389f56c8d2cb89d49c6146fb9
font_01_sfnt_off00012600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12600 18676 bytes
SHA-256: 0b4da4a1e9c7491cdb30db5ff2b364e80e1b6d0366fd384570fab5a4a4aa64e1
font_02_sfnt_off0001570e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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