Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5798424ea190dc7…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 16:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 251166b2a9cf982e6944aafc92de5612 SHA-1: 18639ab02142344d444448ea218876b2195e3694 SHA-256: f5798424ea190dc77a5dbd725dc80382fcfe4b1bf389b8e3ad8b210190a87a69
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/melpghjj4sfndtu8rfbg9v5pu1/4264982328.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/30f15b311ba8bdc9bb0ed4f7c268ac52/limukazaj.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cad520853f---tuwupimabij.pdfIn PDF document text
    • http://lejuriste.ru/files/file/lagejawetijedalupamaraz.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/23497156937.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4rjrvv04qirl70m834m5o7trkh/76057711609.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/pifiv.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/wamuxiwiragu.pdfIn PDF document text
    • http://strandedtattoo.net/file/3143027263.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/84625258618.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c611e1d4c56---93481807353.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d21f286e441---64210153082.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/59508392143.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078096782726---45246324549.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/32521653454.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/51950716454.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f34648455---97215481448.pdfIn PDF document text
    • http://teresachild.com/upload/files/suvem.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210626161459.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed32861449---kupexez.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/32312427390.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/23313431724.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160994868c3d09---96533025748.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/28123949297.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=jenis+jenis+paragraf+dan+contohnya+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_off0000ddf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF7 11088 bytes
SHA-256: ad8358f5978a942f01232cbac29e8c7da86aa04724e4d335c7a9eaac780daac0
font_01_sfnt_off0000f793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF793 16380 bytes
SHA-256: 92435bcc45b4aecee8dd63d29c4f8aa9d7935a0175aaf069cfd7d9303a1498bd
font_02_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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