Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bac4d9f12f9ed7d…

MALICIOUS

PDF

72.2 KB Created: 2021-09-05 05:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39f5de7d0061aab7230cb7fd7b5728c5 SHA-1: 91251b606e355086ce64fc11fed9b7a2d95f942f SHA-256: 3bac4d9f12f9ed7d048449a602254d7f0c5f91d90dec402ceb0e09ee783f3d1f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised WordPress upload directories. These links likely serve as a lure to direct users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608953beafecc---midegikifesawugadurunuv.pdf In PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/jepebawusotubifovorep.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/lidabefuzepubosiduvepok.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/lenurinutetatatigofi.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/dumibasunidimugobe.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/449cfe551dac61dcb0e6493a34cb75b2/supolaluginejozimol.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eff47582c---2799199740.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/batab.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e982ed26133---xezuninubigaxupo.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/71274964277.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/85721855264.pdfIn PDF document text
    • http://petrduchek.com/files/72185808488.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d27748891---tomagirijakutubipeloxisax.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/rekejimetobizajador.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/gekazisafofekek.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/kolug.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/96126055528.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/pekekiwujudekesutemekoje.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/15945321233.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/rebofekawomuwoxalu.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/42103864607.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/gadew.pdfIn PDF document text
    • http://hbtsap.com/Upfiles/news/file///tasape.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/rireletorituvaxup.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8f64dc47aa5cc3d837909b8274aef5d/57859827477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=phanteks+evolv+x+manualPDF 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_off0000b70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70C 16568 bytes
SHA-256: 4af9f7f2c29485b7513e9f29a55eb62a7a9bce72b47ccc465f990e8defddc2e0
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10544 bytes
SHA-256: 0834f8ae91bb805032d0b1e1acbea42ffb038fca36dfc3929fc7eeccfafbef22
font_02_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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