Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d8540b9ca3de18…

MALICIOUS

PDF

82.1 KB Created: 2021-09-06 15:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60e2e93cbc3da81297368e58cc393ff8 SHA-1: c80334ea90a8f7d7d6d8bf7ac854791ada8a4f84 SHA-256: b8d8540b9ca3de184e51239e4ff1c473c65fd0eae3378279517ae251394520b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, while numerous, are primarily used to redirect users to potentially malicious content hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/36868754138.pdf In PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4cd4f4d8---pofun.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/jojekaputukolireviku.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/3fd5c4ee5c4c11c1dd568eec6222e175/42595457924.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/36849495069.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/76840437888.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5dfb2hom3mrmhjue15gtee219/lefetitomuvududom.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/3573591f3a253867c522d90a3839799d/82712876325.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/16282454160.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/94e91b9c4e641a67d765dd120b492c08/mezitanurifopaloti.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/9daafdaa70d1e940851a9a8272739de4/63293665752.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/fowasesixurowaj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6433249ad---xanalire.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/wezagidij.pdfIn PDF document text
    • https://ksuskalology.com/images/file/pevixiwevejezegupojodi.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/kasepuxafoxagasidawisozek.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/vobofefudeninato.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/44a5d7c943cff76ed73b009dc4ea7be1/18492124710.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/95492285674.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/55864701578.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0aef07a449b7b992c9668f67c8dbed8e/dewudibokotekasuwufere.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1628419497.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/wadopebugezuvapenivop.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883dccdc52---18558592253.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j426o33vuke899sjncj2bgpe36/waleja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=adenocarcinoma+mucinoso+de+pancreas+pdfPDF 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_off0000ddfc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 16792 bytes
font_01_sfnt_off0000f60e.bin
25c5d8653ed855389a0b74bb7e7e68fce7909731386b2f4cf25dd562b9509f64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF60E 17128 bytes
font_02_sfnt_off00012245.bin
70ffe11b647206f76df748c8d581502dc4647691634d2b378b31a8620ed29525		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12245 10720 bytes

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