Malicious PDF — malware analysis report

Static analysis result for SHA-256 89fc2dc3c846d2cd…

MALICIOUS

PDF

80.7 KB Created: 2021-09-18 10:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2b4857be0193770ece5909a1f7644d7c SHA-1: 0210c3b8ba228640cd37878687d9936992101c6d SHA-256: 89fc2dc3c846d2cd73fea2e850d023c008b69ca9af4a13a21f6aef9e75eb34c2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to malicious sites.

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://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613570fca4439---15672685904.pdf In PDF document text
    • http://myphamso1.net/uploads/files/5276197804.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/79974967555.pdfIn PDF document text
    • https://ka-base.no/images_students/files/61557298030.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/2757168717.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/20dd21937e74f8092a89b832ad0b71ad/wokurotuwufese.pdfIn PDF document text
    • http://www.puhito.hu/uploads/72008536527.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/3833987074.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/sapobibulibeme.pdfIn PDF document text
    • http://aven.su/userfiles/file/jazibu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/48593647483.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210905_AD84BE586D66007C.pdfIn PDF document text
    • http://www.bash.cl/media/file/jijepakolixataxubikaxag.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/73952219117.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/benatamoxovojutujades.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/fipodotemep.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/diwuzujuzif.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae6d90f6d---fakewusikafawulu.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/56472240143.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/fajudi.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/21716673654.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/68562319091.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/51902587306.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/30386259933.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=dragon+ball+legends+apk+iosPDF 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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 18464 bytes
SHA-256: ee463e011dca3f4283737b81e7e0d0cba98df8bc2a4fc508c681ed2da2a376d4
font_01_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 10704 bytes
SHA-256: 7301e8500ff48c73f917d438194f1bbec8716c5e9380fb0c904f73761e0703fd
font_02_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1