Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86f9515ab1400ad…

MALICIOUS

PDF

112.3 KB Created: 2021-09-03 15:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4762949f44109ded2870de47a60f4562 SHA-1: 60728e3eae140974e774f7ac5c7f068d82b3e079 SHA-256: a86f9515ab1400ad601ddc6649594013e2a5fabf3a6b953908f5aa9b39618b17
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting, indicating a phishing or SEO manipulation attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The embedded URLs are likely used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://alhouti.com/userfiles/file/votuvipadopujad.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0529/adcaa8efe543e5d8eeae2e456db26cee.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3a0eb20e123f748c2511d662e0ebf4c5/buziranaduxagobiki.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/18922986827.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c95d0ebb4ca---latebidugusorawo.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196ffe829f5---pidipekutofem.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac4524053---zaremenewixonutid.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/14454704126.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e5a578c56---26193864632.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d290353ed---kewifawajuvajubupir.pdfIn PDF document text
    • http://cga82.com/admin/File/156726324.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/dojabixelifodijekerojolem.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/39970010804.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077355c8bcd9---37549339171.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/5b4c5af0efd2cbe6293803477557e898/51957039938.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/2144edd09dee0bc2e14e00b35b9136a5/75795863740.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611f16a133b2c---zufabozawovigunuleliti.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/45491973787.pdfIn PDF document text
    • http://dhf-china.com/d/files/17310667031.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/34265738798.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a590a3b5041---89498670330.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/wewaxemulukuzifariretulu.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/3392918235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=arturia+keylab+88+manuale+italianoPDF 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_off00014f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F15 19696 bytes
SHA-256: 1baace6d9bf3b8542c788b4793996d9fc5260781b8a67410492bd7c207afe993
font_01_sfnt_off00018268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18268 10736 bytes
SHA-256: f31b8f47533c3c8e26f6c54372a73c0f6006dba3c4c7969c41cedc03d6184f1a
font_02_sfnt_off00019b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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