Malicious PDF — malware analysis report

Static analysis result for SHA-256 af71d341b50e4c7f…

MALICIOUS

PDF

91.9 KB Created: 2021-07-17 22:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fe3778e6e9d5e63d81deb8303fd94f17 SHA-1: 0869c96cd3107e2cfa45e3ac86453c7c51bc0304 SHA-256: af71d341b50e4c7f07be5d9cb8d4b4551df4145ff9757bdd016ff39bd62de9d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://accessiblevehicleservices.com/userfiles/file/xavikez.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/tvno8trcgi456d7i335jlspj00/tunozotuzatujavu.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/d802c3891abc8fd98abecb77d9303c9c/wiferat.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210626112824_v3lyy0.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b381c42f---barabogarefiwo.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826025b6a73---69340929051.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/l8ap9neoi0mdo929c58fcc8fvd/gokenapugudiweladag.pdfIn PDF document text
    • http://npas.ru/pic/file/vukinafatewulujomimoj.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/nugopidetaxutekefuwi.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bb4288c551588469b55594ddaff6f7c9/sizenadita.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/ba19a2d08cc292c54c310be0718e76ce/29170623566.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pr84hl9s7bmehokm53fsm2pb55/53410907688.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/20766654951.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ur5nt4h0e4v587rmdgsb9t2n50/lamemokusena.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210704073712.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/2dc06731c8bd09cac0b4d764315145e1/68614237038.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/39160347198.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a46ca5fc7---15882184353.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/1951991733cd1ad33e10ec41a713ee29/kaxipu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a951ab474---96934231736.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/a007jbv10ckjub1bn6ronief2k/fabogoloxodafid.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9ef480668b8bfad41db4a8eff360e42/depokirutanisate.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/26da225927a5ba28a6fcf6467411138e/23071254551.pdfIn PDF document text
    • https://medtek.vn/storage/file/ruxigezuwevenog.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/13863308187.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=glory+lily+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 10124 bytes
SHA-256: eef00d43e1dee41191af210fb83b91ece5b77ce93cdd1485a78017112bb641f7
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 19464 bytes
SHA-256: ccb7ce7804d2b1db7fd09874680f4b7b628bec7f46fc7a3a77a34b4f38f034ec
font_02_sfnt_off000141d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000159de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159DE 1692 bytes
SHA-256: dc7658dd34036b18f2a33fa5dad293a96c6223c5175f31ace46f8f83af3accff