Malicious PDF — malware analysis report

Static analysis result for SHA-256 602a5bede83157e4…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 11:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca188df06d1df2cdb2672a73c98b4b55 SHA-1: fd4193649ceb8f68d835f34a5df9b009dbb26ed1 SHA-256: 602a5bede83157e41728008bb2c03a74b46455b070ebbcb31c94049934f41642
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple distinct hosts and a high number of links suggests a deliberate effort to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d5536ae5---79852446920.pdf In PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/5jfibdf44b38hb079f8j1o13m5/kawavinom.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2f139263c45efc98060327cef1f995e1/rogezewusegogefugu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c774a508f0---40072344811.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/10413715020.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ec4d4b91910a973fee6b9f077d53faa9/44919556245.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074339162546---votesudevuxexim.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/otmpuk6e4prmbud2en8eubjc81/97010923037.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/80pv3fnh6acdu8ogdkqio405t2/waxepeledugarugu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57d9710e9d---zisedivarowa.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4197c874a7---21868553702.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/11856883851.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/7af6cdcf6fa82fc877a3eb50c65a5fbc/96540681102.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/punuzusiwasetizupujamij.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/br2psh9agd9v8gurl65kbh5h1v/gedilemujowobejasokibuge.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dd2648e3d---mevubowoza.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec14f9fcf9---lulumujikilo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/ab4cad32ed19169b2480d76e6388f499/62693381938.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/1e5918936a834d27212410a20b64532f/pigugip.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/vemisegejojojejakida.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/mabitifonesosotixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+find+instantaneous+speed+calculusPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a05ca9604bb821cd0655f5bedcc1b73a/8887847572.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 16076 bytes
SHA-256: c49465b94fe86b96ca820c65ff354120e534cda7b3173055630da28bac13411d
font_01_sfnt_off0000fae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE7 17800 bytes
SHA-256: e834c79ea5db53d586be34488e58cf75649f5d85fc1bb1f8979f74bf3d6fdf1f
font_02_sfnt_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 10688 bytes
SHA-256: 8c3db70df196dedd39db56dc187844d5ea2a10a5e5557a61f781069c81451d76
font_03_sfnt_off00014303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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