Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff906eb6a563c0f6…

MALICIOUS

PDF

77.6 KB Created: 2021-07-03 00:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e3a4984fe2a18baa7454a267e6e831d SHA-1: 1b969dbaf84c085a223a2970e4ffaa162e62907e SHA-256: ff906eb6a563c0f608ad91fdffd184722fab830f10cede3c545b9eaaabdfebd2
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and exhibits multiple high-severity heuristics related to PDF link farms pointing to compromised CMS uploads and algorithmically generated URLs. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6966

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://laborke.ru/uplcv?utm_term=how+to+shrink+cotton+pants PDF link annotation
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gg3utrek7h2cjstc6mhs8157q5/rivuwejax.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d38d458e31a---79636186432.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/tewaxumasanipupotaverewip.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/dovifenugowumopigan.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/30f53ae555cec9275700fa9a955002c1/jufeteronuvadi.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/48379156723.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acf873b28---34919120116.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4281a2422---82433283246.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0i3cpao6lh5e864h3rkgml38p3/90096339469.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/39719c8e9cf02abe1ad5551449f91214/zarejarisotubo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/02354c4453a1f24fa0eec5b0b8117a85/67061336503.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/beraroto.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/jezevimagon.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a8db3cdef---37000422886.pdfIn PDF document text
    • https://petala.gr/userfiles/file/40972360492.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97007229b---81406124620.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/5hc4c768lq1naforiq832mulli/nufuxasunodatidoluxuvawu.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/romos.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a0823d72---tileperadulegudujedu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702947b595d---bimozeledomizipafigisipi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5d7f2654b95ea881b31994bbaf0dbe23/vaviribuvuku.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/mezedenunobise.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 16900 bytes
SHA-256: ada21b7a3d80960acc49dda4a64a1fa8f4665338d603406633245d9b192cf97d

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