Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54b1d4c8dd31a86…

MALICIOUS

PDF

89.3 KB Created: 2021-09-07 01:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de9b345e9fd3ce20fc72df03477082ae SHA-1: 2ce334e0fcf45e43a47821e5d6be9d63e19a2c28 SHA-256: f54b1d4c8dd31a86bc6a37096879449b74498fc6c104e367ee35b4571dee32c3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://khodahoanglang.com/admin/webroot/upload/image/files/xawepoza.pdf In PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/b698bc3d0bb5a9beb83a25ff57fdd9ad/98585557053.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0fd6riaa4ua9ftgh39fcdnpd0/notafolotorun.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7ee66857d4c71a60ccfee84f7474c203/piwazeravilabumozuzogufe.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/nunavini.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b34806ba46641bf8969017f97ac165a2/92275187733.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f8d18bd6---18908453480.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/eef6b1b7eea824dfeaaaf7736c023c5e/kadeko.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/xaxokegarafob.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/ledakefokegipefepuwarasil.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/7842678062.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/tedulemiwirijena.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/sakita.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/detaxarigixezuvafeme.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/vumozeridoxamunisexeda.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e39d9c40---buxonakijisimuvidewubupuv.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/24295772685.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210731053547.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/rodakakovi.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/davuguzejopa.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/83961469368.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/15202974501.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/xuvudesorazoxuvigizaton.pdfIn PDF document text
    • http://fabtur.ru/upload/files/tonukulerumiluzopupefos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=landis+gyr+e350+u1300+manualPDF 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_off0000f10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10D 11024 bytes
SHA-256: b3391019b31851ba327b31ee979d68dd7530ff3e025c971bd82d8c3c283b07a0
font_01_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 20668 bytes
SHA-256: 6364fc46bcf74404ebacbe9bf3adc518d6bdc3f6643ebcdef11fbeca1dff2e8d
font_02_sfnt_off00013f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1