Malicious PDF — malware analysis report

Static analysis result for SHA-256 f868677159e40713…

MALICIOUS

PDF

82.1 KB Created: 2021-08-18 16:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b3b907718a90eb3f4b470cfaec309416 SHA-1: 15c7d8a3b57ed50658cfb8995cc00bef68cd9a78 SHA-256: f868677159e40713d4da09a4039ce42a4053a552c4f95d0e2fbbcef73fc86da4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a fake invoice lure, suggesting a phishing attempt. Several extracted URLs point to compromised WordPress sites hosting PDF files, likely serving as part of a malicious campaign. The ML classifier strongly flagged this PDF as malicious, increasing confidence in its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7453491f69---28237970211.pdf In PDF document text
    • http://turnyras.lt/Files/file/wopuxewarupakasoxifawubu.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/31267982742.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/duretekudojotetagilijo.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/fizapugalimezokagezutux.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfa730cd2e---desiretagubureridixumage.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/ledekekezonejomagubun.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/88207976240.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/lukafunilasigelenuti.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160f2549071682---52520991765.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/zilefoviziwag.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/ludokis.pdfIn PDF document text
    • https://cubic.is/userfiles/file/sewizijimotofofuxifimir.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/kiradilaxefimupe.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/17845777870.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/53478747942.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608776c325b01---dunekubagolezetimup.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0db3716e---74477573385.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/jigikopajurativopafufazun.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/kunibuwutaweboken.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/lukanaso.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/wujurujox.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/sotogefidof.pdfIn PDF document text
    • http://falerisztika.hu/tmp/99384476155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ltc+cash+voucher+scheme+claim+form+pdfPDF 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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 16924 bytes
SHA-256: fcaaef5b3e115ffbd66ef6a3ef0b6ac59e772de6b5560a38c70980ea7a1fe87f
font_02_sfnt_off000120dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DC 10904 bytes
SHA-256: 795ca0838cb831f209b14d5a6e13fe08439c5e1fc62900e896f9d54513904da8

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