Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fc9fbe7c2436f6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-03 17:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7225ca0fe7124148db21336a773662d8 SHA-1: 249cb92b13c906ea8de101b6bb1448af74eb1586 SHA-256: d6fc9fbe7c2436f698c2b59f3166eb6d4c5e850f0c7b6d81d1932ae7294de594
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The file also hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript and numerous external links indicates a malicious intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ises.ca/phpsites/vertical_living/uploads/file/sokevegowaj.pdf In PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608954f68656f---kipuvexijuvenawaxuzebe.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/pavokudubifeg.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/1614704291.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/fezepalutapo.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/vizazimaxajefefi.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wekirul.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ef8224a8d---wusumogizesolufixajid.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e47d14bbe9---gomamakegimaro.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/3549906136.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813463907a9---74792158179.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a40cb959e69820e159bbb7726b4294cd/xagobiliniwixezu.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/25835999125.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/54888368706.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f1bd803875b---pevegosubudoba.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/68243478345.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/31561e13355e58d7a8184074d1256ea7/riferuzefixepofofozu.pdfIn PDF document text
    • http://dzbnf.com/upload/file///kapatotepetidumakezo.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/sojuko.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701ad568171---71944781354.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607923fcbc0d1---81599834312.pdfIn PDF document text
    • http://atek-ent.com/upload/file/puxixakutow.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/91297854329.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/36932818060.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd0d61c774---60791071467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=proposal+metode+penelitian+kuantitatif+pdfPDF 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_off0000d0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B9 10852 bytes
SHA-256: 5ca7b8fddc0cb265d7c8d2b981fb8bd1a5dfe2d1c90032e0a8a82687bb2addf0
font_02_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 17208 bytes
SHA-256: 190c874e1b75a71c44af5f13265c8ef0247e66c96aeadcb3224c85494a3424fa

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