Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cad5a415fb9085e…

MALICIOUS

PDF

83.8 KB Created: 2021-06-29 02:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d28cf23c3b67b69aa4f1a9f5e42c21cb SHA-1: 5500459f5c1f5aa993a77818bddfaa03339b707a SHA-256: 8cad5a415fb9085ed0ee8839f093e99c974a2b9487bd5e97dc090ef683c65565
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to external URLs, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/490ef09a56eabe9740e931ee1dc5ab5c/43571903389.pdf In PDF document text
    • https://reparationmobile.net/userfiles/file/68451763140.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c948f9eb1c---15760263170.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/65a57c50179fcdaf9312af38441693f9/sagugosisesikini.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9bdavllkdnfhf5e348a18dgcq1/vejaro.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/48bb691ef64e6cb4c18dc98c12d52dc7/fugijobawupiwofilesutevu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5e54299bd---lixojodopikigivijotibuf.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/b6gl9mjoou65hscc96cfcbm7v2/27400621477.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/51847879255.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5hgv4at6guvnaubpao5t7i720c/31871168360.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/r1hd6s129ej2pu3ogik5nk21h9/zosezoxufizirojoxusenolen.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/34501328519.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/81f22fcd4cd221f41f8a742f8a05095a/gelod.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/jidafov.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/obtr58t25r5ev7t6mfhv6s73qb/josexasuri.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/wuwoxivukuxi.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/ekojevsop5tdu4jdtct6uc8ih7/75573803457.pdfIn PDF document text
    • https://cargobull.cz/res/file/rojosorazesudunogel.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/nalawataxitefunosoxigu.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/28710653296.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/rezeturetomiribelageperoj.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/4v4a3bo19bdnvnpg3rp73s1vne/vepobukozekomakitepomuta.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5fd0b958d36744316eb6b7aa2d072bc6/pebow.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/s0l1to5nabk113u8uahdi0tp85/forexe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pan+cooked+lobster+tailPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 17276 bytes
SHA-256: 88e4123512d46f23367d0be7f136026eb170d25c55aab961b2d5c2c3dc04ba53
font_01_sfnt_off00011189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11189 10596 bytes
SHA-256: 5c5e996a16bf0d8d30c8779813644cc8a12f6b498dcbe9746a457aa02771f71f
font_02_sfnt_off000129dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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