Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9f5954f61767b3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 07:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 657a38278b347e04ec5bace5471ac69b SHA-1: 915e55347777fe17080827db996b69656d576770 SHA-256: 9a9f5954f61767b387a2cf8f717db1287fab046fa3318881b411535e83ea02c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://crewmak.ru/uplcv?utm_term=compliments+that+start+with+an+o
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f8460be73bda02b4c071ace7540cac0e/98607938468.pdf
    • https://hiperaktivite.info/userfiles/files/kinexirapaguxevodibubape.pdf
    • http://ilkyoukais.com/Images/Media/files/getomefilikoxokino.pdf
    • http://uleshuzatshop.hu/files/file/98513308852.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c549bad3---16652376848.pdf
    • http://alarm.pl/userfiles/file/23367621999.pdf
    • http://werkschoenenverkoop.nl/images/docman/files/94038266014.pdf
    • https://nusbetaja2.com/contents/files/64644423951.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348e065640d---3841871719.pdf
    • https://yuvasarkar.org/userfiles/file/80426947759.pdf
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/58033715950.pdf
    • http://salon-urody-bellis.pl/images/file/36107660613.pdf
    • https://dampinggame.com/calisma2/files/uploads/bopijanafuwa.pdf
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/79335265015.pdf
    • https://alihuata.com/userfiles/file/41255686884.pdf
    • http://e-store-sys.com/userfiles/file/nawajebasatolerevivamu.pdf
    • http://yuc-fac.com/uploadfiles/20210914085325.pdf
    • http://www.heksan.com.pl/file/39809936920.pdf
    • http://adams-gold.ru/archive/image/file/67024554871.pdf
    • http://poultech.net/d/files/jazujopominowosukon.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vcuu3fof289c34i5gkiu19q4hc/45293088314.pdf
    • https://holycrosshealthcare.com/userfiles/files/telaxenabo.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145bce57971b---87067663903.pdf
    • http://baoveantam.org/upload/files/tazexixa.pdf
    • http://physocare.com/Images_upload/files/masuwe.pdf
    • http://www.pattyn360.com/upload/forum/files/12151016037.pdf
    • https://alubiasdetolosa.com/files/galeria/files/somuxaniwesivawil.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_off0000db48.bin
e4bcbf475e9970c6f45c4fbbf3b69729a16fd7d6fde855551f36ee857e7d5ac6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 10636 bytes
font_01_sfnt_off0000f373.bin
8f66a2aef8ebf270c849b07483daf7f950a707d9b7fcea7ff65b4c70c981ef57
pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 17796 bytes
font_02_sfnt_off000120ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 16792 bytes