Malicious PDF — malware analysis report

Static analysis result for SHA-256 e948c1914892c2d4…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 22:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2f4d7aaed70432613a451996f867109 SHA-1: cf96f4521f4e31943589d769fd3993828a921ae8 SHA-256: e948c1914892c2d4dbefb043a02b6adfe6a7ad777a404f48531f04c3f247345d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features multiple link farms pointing to external PDFs hosted on what appear to be compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3q11alq4omc9e9jt0sptnlgon3/18751299589.pdf In PDF document text
    • http://ourpreferred.com/userfiles/files/nevedunojevilakofo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/asc9nr8tq4fmrg6unl30sjgk66/sepokofadokolate.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/xowokinonawiti.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bda5e3ab2---vagilisoxulufi.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/30448143591.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/52439817613.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/65926785260.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/62325738130.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/novipekatevijetofip.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/pifopefilemiz.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/01bd4758e15af48938a4f9f3e1374062/1052485460.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/wozalazej.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210914135947.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/vunura.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/86412144659.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/zidiworezofevedaxarememu.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/38838453832.pdfIn PDF document text
    • https://sanagustin.cl/files/79374120512.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/likaruxabig.pdfIn PDF document text
    • http://teplospectr.ru/images/files/33602532502.pdfIn PDF document text
    • https://adium.ru/userfiles/file/nasidupe.pdfIn PDF document text
    • https://majubesar.net/contents/files/64717926313.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/finozizosigaf.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/43736012919.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf6477df5---jojipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=telegram+videos+not+playing+androidPDF 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_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 10880 bytes
SHA-256: 38d3367dbb26ea01cf9760482008a483b3e26ccbf50600f07d170f4f3cd39c5a
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 16604 bytes
SHA-256: 7b4dd61dd305f7a013ec1b5abacb4e21b5259ffba89364081c020047c7d7efa6
font_02_sfnt_off00010263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1