Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68b7dae220abd1f…

MALICIOUS

PDF

87.7 KB Created: 2021-07-03 21:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4a73a6d1340925ca477d411e764c4ba SHA-1: 909c5247616797307f62b5e937cf224a7f5127d1 SHA-256: f68b7dae220abd1f0da43c7977481c67102a17bfde8c8274298183240522c90d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=reticular+cells+histology
    • https://pelletier-tp.fr/ckfinder/userfiles/files/wezenikenikukukuxuzulev.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/d7eeaef65ab777a2189ac9903dca626f/somevuvizixij.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f439857e5809e2eff42174322c1c1f10/61913943420.pdf
    • https://numberonerevolution.it/file/samexuvepezu.pdf
    • http://forter.vn/hinhanh/file/gebawutiwupovu.pdf
    • https://altonika.pro/files/fck/file/305017618.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a44f9a268d1---jekutu.pdf
    • http://alrabbancapital.com/file/files/94160836379.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/q9pjus31ca1iu7rad57t6opg6g/53081202185.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8dsmgas55fbcr8vqk1mq33t29/97207859800.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f95051ac28d3b450dfaf18ac38e18f0/49985057607.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/legananarumavu.pdf
    • https://aspirans.com/files/file/bidofazufoxazefomiv.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd137f442.pdf
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/jusamabawoj.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf659bf93---74392463246.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088e6e1cbee9---wubukiferu.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c03d024f2---lugexo.pdf
    • http://accronline.com/userfiles/file/65996587515.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5039896456---74404831910.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608757729681c---72325190607.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160acba7249233---10556234969.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b6a0752f5---xujolibode.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4dee4f46afbceec2229f304939f0a6c9/71346405617.pdf
    • https://aimara-bg.com/userfiles/file/getot.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a317eb924---37914424066.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f39b.bin
2b29475d7640e894e11c31e7f00b870755011f0da4b0107f2b1721cddad0a446		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 10664 bytes
font_01_sfnt_off00010c45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C45 16792 bytes
font_02_sfnt_off00012457.bin
b217ce15b8c552a491e3a68283d92b297787cd48c592ccb724cb46fbbabd6910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 16768 bytes

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