Malicious PDF — malware analysis report

Static analysis result for SHA-256 526b726d8d951508…

MALICIOUS

PDF

84.6 KB Created: 2021-08-21 12:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a588b90076ff0bdcd758440d331314a6 SHA-1: 5667258f3a93b8e7b225c79817e55f86f5863933 SHA-256: 526b726d8d9515080bcdc5ae92d35b425da77a416e48cee930d7aa3ca834244b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=primer+curso+de+contabilidad+elias+lara+flores PDF link annotation
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/bca99009641113c4be20da11888afd9b/93731512938.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/muraborujedoloda.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c5fd093c2---32114185290.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/b1f967b6adbc5d435db09be6ba65c3cd/radizagupamorabojepegodo.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608351191d6d7---91463496259.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0acc9685---xorex.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76babc37e---lolamorojisagaxe.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/3d69eee88c2e5445cce9f09d4ac234c1/68749301922.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/bedivupinalumimadobo.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/jalafad.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/58117975269.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7da68e38---43572665096.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f2a609b22ba030734c81ce4ca72f0466/dudekogagizob.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02b1c00a1---dokexaluwikitajixot.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ed899d91e---77741653581.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9f5d75553---32942367267.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/raposefupezubugume.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/luvozejuvanitov.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/18936137731.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/jixixegelapa.pdfIn PDF document text
    • http://www.pvvc.cz/files/tujufanifosowavuka.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/38322579074.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/tabupovolitomomonogu.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/18763896602.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/foxuvoki.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/49911918499.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/45810703454.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://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_off0000e8cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CC 10880 bytes
SHA-256: 25a764f7f0b085249f489cee597d22fd2de2d7af23f71d2a6439c689f6abe6ca
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 19168 bytes
SHA-256: 0095c06def23b5f1c4515c014b7df85929316663441d3b5cc820bc631aa780a9

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