Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb19d3e95ffca7d…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 22:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 92b4aa4ea77f9e0cf72f9de1d0006601 SHA-1: 44e60f68b9e436a2b5eba32a6adc7a06e27a83f8 SHA-256: bcb19d3e95ffca7d4d9d0a3a60a5c510cc8e2f8703e12e028cf50a4005654069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://crysiq.ru/uplcv?utm_term=profile+summary+for+production+engineer PDF link annotation
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rdkd9ekh463jmoeetdb2nbein2/tavinukaxixitat.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/80706169919.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca84e2a09c---kenipub.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a20a07b79a---7805515797.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/38982018695.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/91ff28e1c2860c645532402d05b9edfa/51125703874.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-7/20210607044829697953.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb854a1091a---xidodanopevadoginumol.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc814271cc---sesixubajamideri.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609217f1cf030---50808482615.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/20ffl7d1a778a9f792mlrf6oo9/86061191528.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/i8t10mht340jcc380d2vg5glpk/kutegevuzarenu.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/lexoguvitiv.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/80be333f5e18964afcdea112b665475b/gudajufivu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38379bc19d---juterusikureva.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/redoduwege.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/wopararivewar.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/99rscle02bd2005jsrh4viisu3/80341945564.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/f98b5bb0129b91731f9051b3073f1681/zopigerakojinim.pdfIn PDF document text
    • http://artside.org/data/temp/file/64321587793.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d804715cb3---zuvemutep.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/papumadedunilepawesosenab.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/wavesifelujiwale.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 11180 bytes
SHA-256: 97b56839aba55a255f8c6983a7aabf297dc953551c31b9efcb8cf0c8bdb5a11e
font_01_sfnt_off00010054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11865 16712 bytes
SHA-256: ebe7edb079a9c9a63643c0f7d3234503b4007b563a3567bd6729a48845fcce17
font_03_sfnt_off00013013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13013 17272 bytes
SHA-256: 0af84e07f3c84396536dabf98278f617ce83a91fa3c24c96b10ccd365875e806

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