Malicious PDF — malware analysis report

Static analysis result for SHA-256 c104794c2914154a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-25 07:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cbfe57cdba461d209ecb8e1c39478ef4 SHA-1: a16391d74bc507b2e2f04c3ff14794b90b39dc09 SHA-256: c104794c2914154a6b558e0d66f377047748cef64aa27e48204c9aac7bd263fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/9067158096.pdf In PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e580cda92c---vizozukoworiwukixopejuwe.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/53160937350.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614904d036521---forulikabitenojozele.pdfIn PDF document text
    • https://guijek.com/userfiles/file/94843639331.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/87051724879.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/89440088326.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/qf3635hhle47sagsh65duub567/ralobawaduxulubojoxopata.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/tenumafilupix.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/99727210245.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/gugevanozemelituwam.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sozaj.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/99844493060.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/c3l1qrivbgsjtu1ok3kcpr8eu3/66946277098.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/nizebifozozep.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14256895476.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/am280ri1rp188pkslj92dhmh32/56389363843.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/86552260181.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/64828741645.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/93216381317.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/mesunoxijurifebabivudej.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f230de276---gokad.pdfIn PDF document text
    • https://aceold.lrsinc.co/userfiles/file/rorajoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+royal+arch+of+enoch+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_off0000c2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C6 19928 bytes
SHA-256: 6ecc82cd76fc852ae4a51df6648da690619c9004ecffee059b2191bcc97ff4c8
font_01_sfnt_off0000f71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 10436 bytes
SHA-256: 5e06976e54548a39d63c36277870da34ef091ca5119fb012ad67263168f40298