Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf14cc65ee4ff64…

MALICIOUS

PDF

90.4 KB Created: 2021-07-03 16:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b0c78e4de947a0312e4f743b16c85252 SHA-1: eab38a25f6e0fc6795130d37f036e8a446e788da SHA-256: 4cf14cc65ee4ff64c8336c06e9db00eaad46a210f467cd07accffc4e1702c485
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the nature of the link farm and the detection results point towards exploitation techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/fi3vusbi0e3ffl6d2ufi40drj4/70251638483.pdf In PDF document text
    • http://sushikyototogo.com/uploads/files/39195655351.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/13945733591.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/7c3667a8c572f2e6c07d787920ff11eb/68874968867.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33243f908---59254818789.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/69636681251.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/89372099852.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16071634c36899---golimufu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/eaaef57963186ae071e92d778806bc63/80516665700.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/vefoditizomigo.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608254f5c62b7---52596024233.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/b83b75132f8934770f4243475d36588e/86524171331.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/94056305628.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f7c3aa64---zevejisu.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/rosevilanefabap.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/wesibiwirofisuluzakek.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/69843861192.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/61d038dd0e9a275d17114a76cec44094/94689008081.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608269f4d01d8---sowox.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0pt36s2sklp37qoov403kra394/86848127641.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/54934698031.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/090356068616.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/20380888476.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb526591f03---80857338351.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9e697147f---jawikux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=erikson%27s+theory+of+psychosocial+developmentPDF 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_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BE 11176 bytes
SHA-256: 56a7cf30acec48b7026f130e52f99d0bc1478dfb0769e1b5a57cc10c4491ca19
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 16764 bytes
SHA-256: 94dc79b078a7f39ffc1fcd7f445f440842169059ac425c7329c7da3013b1dafb