Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4722ac597caa476…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 15:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55693037aa2024ce71f5726909f5daf3 SHA-1: 3a131cc7cdc0cf399f910a457a8e4dd1845821d7 SHA-256: d4722ac597caa4762423222f0dfa94792fec9cc6662cab2e02a35c8ecd97cc8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The presence of embedded JavaScript and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely to lure users to phishing sites or download further malware. The file's structure and URL patterns are consistent with a phishing campaign delivered via a malicious attachment.

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://archism.ru/uplcv?utm_term=baby+appleseed+davenport+crib+manual PDF link annotation
    • http://fiumevivo.it/userfiles/files/67823643897.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6fcfc7819acfe0172d0b01f7b6990ebf/virak.pdfIn PDF document text
    • https://maviet.vn/upload/files/wevozaniguxuwuwiwif.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/64987285.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/95296383357.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/34278152564.pdfIn PDF document text
    • https://sealskinz.ru/files/file/37601504831.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607105bf42f16---netepodukujuz.pdfIn PDF document text
    • http://scro.ru/pic/file/gagovu.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/48045517664.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/4125542764.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/voteloragolexonelo.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/zifetelupi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c04e2a21790---xedoxiwe.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r21ufbbia7t00jrg1gc3ji4pdv/81396505643.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/17473050802.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf3bc66dd6---livawapuxajuxajuda.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d39e9fc28b882f53d8d25b7514fe9a62/rogoxisalosaxif.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0de4efd2---nuzir.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/0568kj0k41noch10651c6b71n3/50408363925.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4711c98ce3---fekogenidojajepize.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac8c4f778---3502912520.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/60216339470.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/13508994808.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/bowubuwiwutedakatipusoja.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_off0000cca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA2 18552 bytes
SHA-256: 82af7499a616715ecdf78f17310f6577fdbffe66f82b124a5623d8f8563a94fd
font_01_sfnt_off0000fd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD25 11148 bytes
SHA-256: 27932d53fdced430332d6717ebab3b5ade90cc2b5812b9b3e87825941721f873
font_02_sfnt_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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