Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ef97335f7ef938…

MALICIOUS

PDF

83.0 KB Created: 2021-09-20 20:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c81184080af0d6e7bf5bc2f118594835 SHA-1: 71884fa86fd4c8726fcc032704cde809c5a88519 SHA-256: 38ef97335f7ef9382dd0fee559595c6ffb70ce0d42f29d217034d345961e4886
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm structure suggests an attempt to lure users to malicious content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://oniceh.ru/uplcv?utm_term=z+pattern+lock PDF link annotation
    • https://beamstraffic.com/amb/userfiles/file/76990009338.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210903_07C9CCB399D37325.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/83597714336.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161405ed22c46e---22932795060.pdfIn PDF document text
    • http://juncheng.tw/upload/files/4942664675.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/zogeranuxomiz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/c07f490c1a6a4b4e66fab68fb1e6bfec/fajamafefinebujijezuz.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/nanuv.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365380df9ca---jugezevikin.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/79554805957.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/13473622589.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/16885013226.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/18566801007.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/rujugagados.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/58404746171.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/susoxivufet.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/4649234900.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/53902977882.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/sixixix.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210918053740.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/jogazanosifebezelaleni.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/kuxowefibajelo.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/xupexafulinikubogapuzek.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/39886754490.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130db2d135ad---vujamudanik.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/misasotawe.pdfIn PDF document text
    • http://www.pilartangguh.com/file/zuzivibifefuxonosawetulo.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_off0000e084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 17860 bytes
SHA-256: 18ca314ccec458034055c92259c45632c59f2a6980933c20f77609e2e352ed95
font_01_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 10160 bytes
SHA-256: 7f6a3b87c3612a86c897c96232545ef1c43697db8e0e9acfaea5cab443629147
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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