Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43a6dd9a3dd042d…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 18:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5f48412a936c237c91c9a82eea0f9dd SHA-1: 3ae15ee82a517611bf91b737c718cf364851eeb7 SHA-256: b43a6dd9a3dd042d35a5e5a73afe551dcf1a52ec0d86fe63bc91db79f89a0cdc
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF document exhibits characteristics of a payment redirection scam, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. It contains numerous links to external websites, some of which are hosted on compromised CMS platforms, suggesting an attempt to host malicious content or redirect users to phishing sites. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics further confirm its malicious nature, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. No scripts were extracted, but the embedded URLs and link farm structure point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=how+to+remove+a+charge+off+your+credit+report PDF link annotation
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/78335056431.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/zidukutifok.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/dopesufiwixutone.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zimulonidezunowoburufitod.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7327affc6fb796b593977a16c67b6944/gibilexuzirerez.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610eacf0abe30---dafasanuwulegopux.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607448650dd07---10163822397.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b820210fce---rotanotafuxupuda.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/tejowi.pdfIn PDF document text
    • http://grabnerestriche.at/texixegafamedomikigofovoz.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xovegebixemam.pdfIn PDF document text
    • https://avflash.nl/upload/files/71528850597.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb984d3b1---61164331183.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/bee0a9f2c81ea12971f79f88dd9046f0/23276105392.pdfIn PDF document text
    • https://fallsplat.se/file/87896822535.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/5268132850.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d3282cd97e0ee1688a439f99e2db0e13/27238433294.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/falemovilupowebotodipuk.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/92988909305.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/75090779147.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/zekeveganuzanumikasij.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/zidinugirezukasebivapes.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/5275769878.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c237d1ff---33856286921.pdfIn PDF document text
    • http://xn--h49avwqct32ewe967crscpsaz7d.com/ckupload/files/70959140956.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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 17500 bytes
SHA-256: 085e3e7f85e012b9be4efc26fecf27555ce3cb811c168673f62a84dd0b7c0163
font_01_sfnt_off00011ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF4 11108 bytes
SHA-256: deac3e3bb8c0a0ad4dde3e7cdf6d8a4617fddf1444b3984834f07b079bd0d198
font_02_sfnt_off000138bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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