Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c47fdb804805ba…

MALICIOUS

PDF

86.7 KB Created: 2021-07-09 04:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a04fedd272037e9df2ddede5ec76d57b SHA-1: 2ff8171943e5cffc87fae5ce7c12f4dc3f75b7e6 SHA-256: b8c47fdb804805ba163bbe558c61e4cb98449dd95cd00c94578a59a8c9066e11
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to URLs hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, and the structure suggests it's a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://alexanderjamesbackcatalogue.com/userfiles/file/tupulunenis.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160728904a6a64---67355157724.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad2dca988---wagobexabox.pdfIn PDF document text
    • http://araonline.hu/uploads/file/jaruzixekewufodopuximodoz.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/322729b06593879c76115ba74bc10de7/21090403299.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hjli8b1ilq81qupinuh77u1adv/nefagotepolaxotosopagipe.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/dimiwa.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/13414749805.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/loxesu.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/49653525413.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/77415907212.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/49991573570.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089e8edcea3f---23081258756.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6df9382f844bac30c716a2011d95de93/pumojusefuwit.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16231119213938.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/dijixosinewoxozipo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3503798769---wepisabegitikojasujuwaz.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078d75d5b269---dibivivixikofavuritiwapil.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a3ca4ddc5---70574218018.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/xudexazadasazubefenuwa.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/d781d006fc35df6d1502c6d96260d7fa/67598451970.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dca3e8a0214---dezekusuwilodufagavanulem.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/96640178684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=international+conference+on+autonomous+agents+and+multiagent+systemsPDF 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_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 10984 bytes
SHA-256: 6453fb845215b40b7282274f25d632bdcf3c20edaab111fa1c22a84d731956c9
font_01_sfnt_off00010932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10932 16772 bytes
SHA-256: ef41b4ac14929ebea64818b178a30b555ec733f4d2f852e3dd25c0998f726062
font_02_sfnt_off000134b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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