Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd2cfff83c9897c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 03:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9843e47e5ee361462c06a9ec288ec97 SHA-1: 125490b6b75ec76131a1c172fa6fe8da17e47f79 SHA-256: efd2cfff83c9897ca49ac64bdf3f826640ae3123ffcb570bc9ef4f313d38039d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and the high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=menggabungkan+file+pdf+berurutan PDF link annotation
    • http://szentimresiklos.hu/upload/file/12971770775.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/sisowogedevo.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/49806635284.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/nexopap.pdfIn PDF document text
    • http://tigaintan.com/contents//files/muzebemewufatitesapo.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bd657b0f6---72028530585.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/remupubugekazupibizavo.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/53175071722.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/35542702510.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/fomap.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/abbe3f54a98a3931e978d5c2da33a3e2/pawakowotis.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/46142011259.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96b8e5714---33855441241.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607941314882f---35983399502.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608b791766d31---lezosorefepuwegovejuvovom.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f8b40765729---puvorabibexedokibulomotef.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109011312507035.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/nazopesabagabunutawudoxid.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/91721104005.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a2752122ecf3508f7a301342969b1abb/wisetalinafo.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/gejamadatetusagiveviguv.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/nufiduporonivowitukida.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/68eu0908q5cjq03kf9bvm37iln/vimarakuxatoxibupef.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/91254547540.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/peretuzokekafotutikafuram.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/1f7171274bee2ac34fe3bc9a0c30772e/dalupepukifem.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_off0000ceff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 17672 bytes
SHA-256: 515a05ddf00c65cc84c5821bea8d969353c16699f7c5fbe4ea74e39e053bd82b
font_02_sfnt_off000114fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FD 10708 bytes
SHA-256: 17d9c9465201fe791ec3bc0d68cad78e563fe8578ef88eafa4845d9bd9ac2c60

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