Malicious PDF — malware analysis report

Static analysis result for SHA-256 8566942dea82fc19…

MALICIOUS

PDF

91.7 KB Created: 2021-06-25 21:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 125a482b0e6dd6a58e54f9de2f00662e SHA-1: 180098b4122320a43949c378a284fa926852577b SHA-256: 8566942dea82fc1986c0179f6069d64be9d2254a62936abdfbf08b075a9189d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload directories, likely intended to host and distribute further malicious content. The presence of multiple external URIs and the use of compromised CMS upload links suggest an attempt to lure users into downloading or accessing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a890b3d6657---92617885554.pdf In PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5e8c0f5f6---fifaxabud.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe76802ccd---zevabu.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/79952008708.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/tifuzojotogidato.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae947807367---94068376477.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nagapidofozavameliwibaj.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c1ba2430---miweriwawipunarir.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6866630bf---10942550708.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608accb1b069a---67285978900.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7c3d583ed---fujarokilixibafal.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a42b7942---gexiv.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/87586559605.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adba5a0eccb---dujufomovutulixod.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/5c5pg8irf9qsdhelb9vl9fa667/baxojon.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/kugokusopaliragemupikozok.pdfIn PDF document text
    • http://jp-cable.com/d/files/34381185513.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210605055331.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/20530934879.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a514a3cd8ac---sinuzinavudoxidinen.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/20fi4elnc7kdaai5qmdibm6btr/58925219702.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/saxunakatojerelabemasanim.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c18c33096ce4a7c525985ea021ba3351/26856842508.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/ab8fae4921234724197420f9b22ddf8a/89439704430.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/tinazafulabi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8123ad4ee4---zejukawanoxipumapuwaxizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+answer+tell+me+about+yourself+as+a+college+studentPDF 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_off0000fe06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE06 19176 bytes
SHA-256: 2b0ee976698d694cb077300f7ce68502f199a93c7aa8db3749bf43a213117d2e
font_01_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146FA 11160 bytes
SHA-256: ad0afff1396392cdd7818c4b6bd5fe43fed80b69943afdc25beb387b5d33ef68