Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57117b40cde4ede…

MALICIOUS

PDF

82.4 KB Created: 2021-07-13 23:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1e59362615750ef086627d1f456e7de SHA-1: e2a3edd29ebda8f2fe3ca823a8fa5671e99b6948 SHA-256: c57117b40cde4ede2cf8a8641da568d9525b05a1dbaf881306b4b3edf8d002ae
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=farting+gif+funny PDF link annotation
    • http://anhuizhkj.com/upload_fck/file/2021-7-6/20210706195259973486.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/hssfatrmkq8jdrqi12a68tmsfp/91576869533.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31492b5730---89622069044.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/eec866e033f6e9b60e2bd4d5745c3856/85901961179.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/fdb3a2ef3d719940d21b2074d678263b/8589665781.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/dotegama.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/velujolebuba.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/ce7c8c73f224a0ca5447df6ae36fee92/6745691363.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5255e79bb8106d79606ae9179a69f5b9/ligasipexefo.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6363e6feef6e83f24bfc6db6cb593519/lezemexadogipotizaf.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d3f386a1a---giwinudosujeg.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/vumamawivebixizunapir.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/60297420389.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fi3vusbi0e3ffl6d2ufi40drj4/70251638483.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/jawesipu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16070385b24339---69981111771.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/nerekomeluvawox.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/66398293168.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/oinfqjpnk5gu3fdo314pf5p431/wiwovivuji.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/78264178572.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/72060227457.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/zodepize.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/224c7f7e66d87ede4b384fd8627fee06/boxuvon.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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 17372 bytes
SHA-256: e8ee65173520344f8ffaf55d77fe4a33bcf258d63d1c1ba2365588c066f7426a
font_01_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E3 10116 bytes
SHA-256: b90e0cb333add04e46e5b4020cf419f7822d064b35f7e17a2d9505727dce11b7

Open this report in the interactive analyzer, or submit your own file for analysis.