Malicious PDF — malware analysis report

Static analysis result for SHA-256 03443b056bca09d2…

MALICIOUS

PDF

96.5 KB Created: 2021-07-23 15:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d874408ff72aad0f72ebed5e8526ff32 SHA-1: c73ffd4d0cf438bf489333de664fed17cdf7da79 SHA-256: 03443b056bca09d2473a2649ea6d812644d252cc72a19a74aabe1bb6a222cfe6
136 Risk Score

Malware Insights

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

The ML classifier and the 'SE_PAYMENT_REDIRECT_LURE' heuristic strongly indicate a business email compromise (BEC) lure. The PDF contains numerous links to external sites, many of which are hosted on compromised or disposable domains, suggesting an attempt to redirect the user to a malicious payload or phishing page. While no scripts were explicitly extracted, the nature of the links and the lure pattern suggest an intent to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://cy2hand.com/userfiles/16109548875.pdf In PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/bugobolelunap.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/tupanusepivulonopu.pdfIn PDF document text
    • http://lottfamilyreunion.com/clients/878857/File/ropebasalugasibusa.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/bizunatowefiwu.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kuxuze.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/m2ambvhhl16425lu847kdua9f0/50322185686.pdfIn PDF document text
    • https://stvorki.ru/files/file/45177923196.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/riturewedo.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xewufipajifawifuzanag.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/a70a983fcc43477d3d44bd5eefcd3344/93342539515.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab567349ed---kigotinujudud.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/30a4182510395f954d3862a6b89d54ea/senomukot.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e939cf7f2c4487180bd848a1406e230/devafazakivorixukaxiwa.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40d3b6e86---30926652899.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872684da613---46248145774.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cc5140cafa37409562a44c5c0234cf84/ditupijozi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebbb8c911---jofejidezimirezof.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f2dbd6c0de0---migejomu.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097abae4c5c2---89247729728.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/puzazedumovufixusodi.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e5c8eee5---vofomikarifimagix.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/58326320380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+many+votes+for+majorityPDF 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_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 10716 bytes
SHA-256: d12133349d4a1c53740ee5caadc0f036befb461513ba779c35a87562d101ad04
font_01_sfnt_off00012c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C25 18480 bytes
SHA-256: 983f231465c01b81877cbe5e00d1234e28c1ff168f0f987dd985a56aaecb5cc8
font_02_sfnt_off00015b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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