Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab8d34bc0ecff17…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 17:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7b36a122db2fc1d6cbffa673d1e04a16 SHA-1: 64026eeac2f3840c994f8b000d2bc0938db888d6 SHA-256: 1ab8d34bc0ecff17f80d5cdc20f046e4d106dd5997fcd5955fb6aa39a01f1d68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to obscure malicious destinations or for SEO poisoning. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=gmail+emoji+meanings PDF link annotation
    • https://hyundainhapkhau.vn/upload/files/91067804498.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/sigitososamuxaz.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65092205222.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/dawod.pdfIn PDF document text
    • http://anindecor.pl/files/file/6596772985.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/23541910847.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/gebefuvosotuxaxop.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/xaxesib.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff7c892816---72078816146.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/63799737983.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/bf6f693f87b68bd19bd2351c7163fe2c/53140711111.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/wijubevojeko.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/roxatimupivurugedeponizav.pdfIn PDF document text
    • http://vecsecity.info/editor_up/xofoluxinuwulufar.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/vuruxenosoz.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/67131069163.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/60606346135.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/19145738446.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/89171292747.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/42770915178.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/14438248784.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/67349280974.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/b8c086bb13ba312a6cb2130765fb16a2/bexeberowulewema.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/89490325371.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136d082953ff---78733585602.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_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 18076 bytes
SHA-256: b9cc2df2003f3deb3aa9546e9c28c77aa1ecf01afe96ae3e0070e416b81b5bf1
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10420 bytes
SHA-256: ff9df3723ce78e1e89eb86767ed358cd5410e99528f8d01320ba32d2c466a97d

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