Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff089d92c4698280…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 13:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 437b7a7941cd831e7198801fef5c6bdc SHA-1: 92c87373807e7c3265ce2bed2514eb477c98df32 SHA-256: ff089d92c4698280272b452f1dee74abadbdac29881e36569a4b431cf9712308
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The presence of external URIs and link farm heuristics points to an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=watch+breathe+season+1+online PDF link annotation
    • https://cobrawire.com/userfiles/files/2927147271.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/1230677399.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/lazoravupu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/4177686223.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/tadepo.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/3070640329.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/41002525754.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b09740b488c925553ec367f852e1b72a/pejakagakelevaz.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210908031148.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zevorudexedozos.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161361121f1ed6---tesavagesunoteronovo.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/kimekezakisolavas.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/razokomaruwezeguxodujimo.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/mifuwapi.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613821d614cf5---voxisinajokewir.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/55969907426.pdfIn PDF document text
    • https://signika.pl/Upload/file/30673794627.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fc710e954---nadigiwot.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/rilogazabezazaf.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/13712448774.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dilibagon.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134d8ad3432f---584177036.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/8240745497.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_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 18172 bytes
SHA-256: f9642044967d1ad674663f8183c5b6295f206f4a8a58d2260647e47dd5a3b142
font_01_sfnt_off00011387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11387 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 10512 bytes
SHA-256: d0ab19e5a045634d804ee16b58f7e54f9559805553b5427d309f45f4d933edca