Malicious PDF — malware analysis report

Static analysis result for SHA-256 365737343f8f786c…

MALICIOUS

PDF

92.7 KB Created: 2021-07-14 03:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 680cf81a70c0c72a6f98b43574e10fe5 SHA-1: 935e2b073ce132b9cb4ecc07e15ea1f646b76eab SHA-256: 365737343f8f786c0ddcd60ffd8f462017613d7a51eff07d70dcce38e891a04c
136 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a payment redirection lure, suggesting it is part of a business email compromise (BEC) scheme. It contains numerous links to external PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d4f67a4e---zanituv.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160873fc4b5475---20046535486.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086178f80855---rorom.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/72196804759.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98893ac669---votujisosekokobisofa.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kizafedepebototimuvitebo.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210623114339146.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16d85e85ffa7477d555049b3d9b3fb7f/10287516153.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/aeen75des42dr4c28gfuki9vn0/34348255261.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3dcc11fb---kuzuraraxudup.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd8ab1969---33287124125.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/5721294910.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/geduxusid.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/33108479514.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6f01215d448bc305c33eb1c8b10db416/bonukowawuxemirusefojuv.pdfIn PDF document text
    • http://dytac.hk/userfiles/12193003353.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/1dbfb1a5af76dab8314292a066ccb730/veweniwikurijolevexo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/68264287857.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/gunulirelusofijeso.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/setux.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b784a5ef63---60871508708.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5esaqlb1ou525ng92ba4r0k480/72000573061.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/90933122815.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea0f139f51---futidumux.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a85c297073785c1b93b82e6c98ddd51d/15424182402.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/6663449144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=wow+classic+server+migrationPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC1 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 10716 bytes
SHA-256: ce1c98c4ec67c34709b71f981223662da05800b8f343b244d55f930112f3b426
font_02_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 17500 bytes
SHA-256: c008bdccddade80238fee3c5769b68ff83f496c49222e7c9cf363a24d7030d8d

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