Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59dc3c1f1864a37…

MALICIOUS

PDF

79.3 KB Created: 2021-09-22 22:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 49fb54bee9bdd41945f663767c3fcdd2 SHA-1: 301b83c99d652c0c82d9c5d8074f76119ca1b4e6 SHA-256: c59dc3c1f1864a37ffada4a5a5e5529b4ab7717a38e1a75715d3ffebe939fe5d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to potentially compromised websites and disposable hosting, suggesting a link farm or phishing lure. The heuristic 'SE_QR_LURE' indicates the document may instruct users to scan a QR code, a common tactic in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://infrive.ru/uplcv?utm_term=ringtone+editor+app PDF link annotation
    • http://yacpa.org/yacpafiles/file/dalojewi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b61f8c40fb---27169389836.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/tonatede.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf1942b681---23393493781.pdfIn PDF document text
    • http://vtaky.sk/media/file/talofunuvopalexekikoni.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/84964232204.pdfIn PDF document text
    • http://dalaichau.com/files/74742215394.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/jipenobejuwatakixeged.pdfIn PDF document text
    • https://ptogel2.com/contents/files/29190695163.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/sitilekaxubinejele.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/82698004158.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/luwurobakumidilaligipe.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/70470830518.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/8500019637.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16318315404432.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/mijumesarupebifolot.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/37107308815.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f3bd64ccccd9b5299ff07a269c16795d/xodofezojas.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/pavemu.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/vinivepamejaro.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/pibugijomorutapobumizoso.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/xivosowumosavureg.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/3927832735.pdfIn PDF document text
    • http://megalaserasia.com/upload///didupabiwabogetijimafegi.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/gowujotakomojafu.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://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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 10396 bytes
SHA-256: bf05f2f394a185498058ee378f4a0c8dec5a3ad82f86fe9ace5539c30eac50b3
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 16836 bytes
SHA-256: a0f3efbba7a05c447161646670f0aa7475bf6cade69fe88c3ba43943e00638c6
font_02_sfnt_off000117e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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