Malicious PDF — malware analysis report

Static analysis result for SHA-256 891189ebfc239ffd…

MALICIOUS

PDF

82.3 KB Created: 2021-08-25 00:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77b2b5bc16e8ac60542adfb2464bbcfa SHA-1: 36bd618e035f4a9ad1061da9ce68b2e9079de7d4 SHA-256: 891189ebfc239ffdc3e88fbca9decfb686ff302a59e692b2f79eb0e4a343a325
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, suggesting a phishing or SEO poisoning campaign. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7tjj4sb3ajv2lfj6ttor6joq0d/pawavodusa.pdf In PDF document text
    • http://dancedynamicsla.com/clients/38740/File/75394191885.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/wakaloxuwizomepa.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5af83b94652045452b07cf39b045a5e/62625396109.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/32806068702.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/55862925964.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6337104ca1a8234d56e49d1e942ad7b8/50948579375.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/914e9b68444554ce7967a8e1d36ef838/65034913901.pdfIn PDF document text
    • http://abwva.com/uploads/files/28434021196.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/13012093452.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/somomodubo.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098313d98682---panupesod.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/75c80bf1743cd4171a58a42776dc5d2a/63147991081.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/12000466812.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/duvififevisulipaxu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e8326b5e4---vujupixaruburam.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16263496911453037711.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9e724cea05f2f3b4301e016e3d56ba9e/6450765039.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/46700024361.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/93820678852.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d0c6f06b428f5afaa5c1cd2f24e49f58/47133688817.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/84b26382a9328706a066d2a5b2856c19/24167422414.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/pifamivoxufotoronejof.pdfIn PDF document text
    • http://coachhouse.info/assets/file/90009277039.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/2f375d6bfedbb4f67db1d9c134dd9163/dozeno.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h0j56m6uj6bquqj5hdg3l141mv/kijuxujavuvogaxovop.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/8c8jg48ket6m7d82gbp9651bn6/55758370163.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+use+an+elytra+in+minecraftPDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 16680 bytes
SHA-256: 718969b25ee0432cfa11aee7a7cbe49e9a14628db773042a1e863613d38469bd
font_02_sfnt_off0001200e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200E 10928 bytes
SHA-256: b4500fc225bd31d3825e19ff82c48d53223f160514fecf6b59507f71bb898f4d