Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0f212a7e4e27c9…

MALICIOUS

PDF

81.1 KB Created: 2021-06-30 21:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 50347e112bab6ecc53e101d36151c063 SHA-1: a6c527082a9470ec6e6ade5516571aa144e859f9 SHA-256: bc0f212a7e4e27c947fdf915ada7b1fdb5f25d5b614606563b807de2cce8acdb
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, suggesting it's used to distribute phishing content or further malware. The PDF structure itself does not contain readable content, but the heuristic firings strongly indicate its purpose as a malicious redirection tool.

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.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7af1c8b29e95f34080088939c28dcb68/43778269957.pdf In PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-20/20210520103134179707.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ae1a8748a---lufebozigibad.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/kiwabiravinukixeku.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899702b5ab3---darelexuzivoxivunojitok.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/67f9dpk93ue21focehrh90eha4/vapezojoxofu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d54d41b3b---26713525502.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6eab74de---12643610242.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963df1069be---viziveda.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e6c51ff1---kowotikixifilamogog.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/jevufamotejufuruf.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/orr82hf0c087qslo653qj4phah/14926814297.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/l66i35ge7rvfkerrj9pikbjfqu/miputivikuzef.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/92500353691.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/26754119758.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8ff31712---4926575651.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e78f989c12be03b2f1f50fce5ee95c23/dagom.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/c6899b1192b9f7d46b81134ca923289f/tetib.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1c19c49e5dfef1d40cf1f340d4058058/89530028705.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa392950c---49884632673.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/tf8fmtnseouri2mniouq7lgm8t/gomipidanogukeruvotapa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/769a0c0d632259df079680f84c9c51e0/63630198340.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/75183423936.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b78954a5---zogexowivarawuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sinach+dance+in+the+holy+ghost+lyricsPDF 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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 17164 bytes
SHA-256: 19bf8be7475234724e98f18d80aec777ba29cb20da0684d075f367e61b2e6be2
font_01_sfnt_off00010667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10667 10836 bytes
SHA-256: 93b3160a09fbe6c2ba47073bf021ede6da0fdeede5ea9bedc1be62da1453f70c
font_02_sfnt_off00011f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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