Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fcf1c20296e61fb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 02:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 042be232ad303f87a9b17ba53be68977 SHA-1: 50c6c47f172757ed6c4e22b76c4a887ccac2c0fa SHA-256: 5fcf1c20296e61fbd967e08d98cbc93e07e9cadd1de5f5b0458afca85c6a2472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable domains, indicating a phishing or link farm strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive link farm points to an attempt to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=circumcenter+problems+worksheet PDF link annotation
    • https://indiansabroad.uk/userfiles/file/sedamu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f9a08f0f8---jidiretuxum.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/d5u7pr1m4rl101pbdp13kosqoj/24302526889.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/69756577078.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3da606a78---17203873848.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/t439u157usuvs3tck92dal5ua2/fugubegonasuvawidanuxoz.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/46ve7es0rg299m0es8k7bmel8d/91120341453.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9c7fc788c---wanemusigodazus.pdfIn PDF document text
    • http://bluiettgriffinwilliams.org/clients/2/2a/2accc941c041fffeac9751862bb8fe41/File/gupob.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/63665340163.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/munigumuvo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced5132026---pizejekovogamebom.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16074870e168b6---vaboromawazipejex.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/63986199443.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/duzinizanotagodafugabuzi.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/32963413566.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/fukijalu.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/4999512282.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210612_AC2495127B2596EE.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/bozalagibafalilezotivanu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/suputefav.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/15058182496.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0bbd9cfd---68180953305.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/69b9112e4fb0d52eb64feac6407627cf/norikati.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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 18092 bytes
SHA-256: d4b78c8ccf2b1eb43ff98a132a05da7c449270e4ac5016e0a0f6eae5ee1fc8ae
font_01_sfnt_off00011230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A47 10924 bytes
SHA-256: e4bd45cdffd0eaf5244fdf4fa0562182702f97e40b15a85f706ed0797a3eea4a

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