Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a599f1f1bf83cb0…

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 13:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 95041f7332adca2aea224e4d6074d2bd SHA-1: dbfa8cbe1bbea675726cb4180c1a17a7bb19b7b5 SHA-256: 6a599f1f1bf83cb09c46c519659c9af5fbb33f441ae3fe3c8bad096a1801070d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites, indicating a link farm designed to redirect users. Heuristics and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ce3f5524c2f1975bc858e69b3ab026b1/zederol.pdf In PDF document text
    • https://damiel.eu/userfiles/file/59964402643.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/bokudijitozevexitoga.pdfIn PDF document text
    • http://legalinet.eu./userfiles/files/bepagulok.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/4018308808.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dc53d2df4---bopupuriramonajiri.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bde805001eae83bde94aa18bcd5630b2/lomigozawagijatunelilisu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/43120355207.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/65119278031.pdfIn PDF document text
    • https://avflash.nl/upload/files/podigurokaf.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/rufnjufs4ud3nk58u23imenh0s/maxexepapofolijidam.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b30da537f95---vemenekezawufet.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad20667a6c---99698103682.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4d1475b84---balutolosowexu.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/vutuworasufumiferutovu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e6f3bf1add10138946b3cee63c17a1b5/58469513738.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/libikewexipajomur.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/tqvhcch2ef5ttlmdvdj9rsfsm7/kanoveromobowanurajotij.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607405b341f95---27568084873.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d74b6efb1e---jolufabokupesubejejaliwa.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/sudusuwonado.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070d4fa57a95---ninozuritaponibonap.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/72917670722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cheerful+mood+meaningPDF 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_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 21400 bytes
SHA-256: 735d724cf479a6f5bffc796d226af706977f5fc8cfe58653ad4004a95f93f0ff
font_01_sfnt_off0001125b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 10668 bytes
SHA-256: 153388c018fe3c281a2b1bc2fddb35deaa28d915f4864f35aed064fc11b27f00
font_02_sfnt_off00012a58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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