Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6489ab8ff2ab641…

MALICIOUS

PDF

96.7 KB Created: 2021-07-23 11:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5fd1db93a0bf68921f8189ed8c1d1435 SHA-1: e5a4eb419a8c8c8ec4f07b395417384aa678d0e7 SHA-256: f6489ab8ff2ab6412881d83087d91bd4872865e82c2a9d0a248f3dd7fc1099fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nada70.org/userfiles/file/kikibetoxovezup.pdf In PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e13112e77ddda7cbb5a0b13801af9403/61065218421.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/16072628631bae---13127100460.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/7f2bac5f42a817bea265238c41eebb30/75747215122.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/59722881170.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/labafopalexowixuvuxe.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d23e8b1b4---mugazijibuzatopinukiranaw.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bf4bf2ea08c99bca3b7f1dfe3c9c45c3/rinotumesitulenaxunafub.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3597d2ffb---54290458672.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/redader.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8dc8d547f---5492756952.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/2775317901.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/diwamamodufebuxor.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/47638019803.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/218bf06a9ff68bfaf0d0f12ba9ecc68e/43909982383.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/98535955050.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/nuwozub.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/850919ca57459f9fb4bf12dc45333194/19885596695.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/mowuxulowoniputikexogo.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/69f707ecb60c81838735091f8f53091f/42736712773.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/zisaje.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/nusonujunitibaw.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0b37f789---gikibawuzasokosobawej.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844f9cd25f9---ruwebanorusoxefu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=game+of+thrones+s08PDF 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_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6A 10708 bytes
SHA-256: 992389dd3b168a1148d3e6deacf44e71554103473481e6032ee1cdf2b5203fce
font_02_sfnt_off000146d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D6 17748 bytes
SHA-256: 62a520edc63b1df63288b9d8e82a01033cc91f84af5461fe4e7413094a8a9073

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