Malicious PDF — malware analysis report

Static analysis result for SHA-256 5532e03f1687da1e…

MALICIOUS

PDF

84.0 KB Created: 2021-08-16 02:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 834c0e1b4508b697ac287d5b4def9eab SHA-1: 4bb3c122015761c9869fe54b85625980cf9a7915 SHA-256: 5532e03f1687da1ee03ac23353522c20c732700bbe706e560a3c38b165a9b140
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are indicative of a spearphishing attachment, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=le+butane+et+le+2-m%C3%A9thylpropane+st%C3%A9r%C3%A9oisom%C3%A8re PDF link annotation
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e3108055f8d0b38dd00e1f7b5ffd5fb3/33860163315.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/38032961546.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1d3e90fc---9090957913.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/23612843358.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/44463427714.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3100f201ec---rokesada.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085adcfddf0b---bemomirezuwojuta.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4894d0a000---kekudivafuwumiwunuwik.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/82286346239.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/16803078151.pdfIn PDF document text
    • http://klinok-saintp.ru/files/basob.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/sutotizivuw.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/neladubowudik.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pqg2i3ulqtggrgf0fjq3a5r6d4/98035792250.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d52770163f5877bc6567e0cf2f12d1ba/39235479243.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/jupuniwujudebebexekumexis.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611680f6f3ffd---34960248160.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/rcc4p5tasa4opttavhl0bo8f5q/60405473262.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/zarebawubovizuzafefugeri.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/volaguvuwutunujofalakez.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lozolikum.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/37256269332.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/ninilumoxu.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_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 17964 bytes
SHA-256: 09a844cf22c149e5e36bbb7f68912a1efee5564097bdb6ce22153ca1d7669c0a
font_02_sfnt_off000124e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E0 11292 bytes
SHA-256: 8a05c50d1e07750717384845a2381ccf4872e9b4360f632905f374245c19481e

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