Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0b7e77f1d935c…

MALICIOUS

PDF

87.4 KB Created: 2021-07-07 17:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dec8ad2214d4f58d5d77de4238fe00e4 SHA-1: 8d2d474f11092b0aa3f692881df275255671f09f SHA-256: baa0b7e77f1d935c8c829bbeeaaa9f71310eac58db99db879d6e30a9f06fd776
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious actions within PDFs. Furthermore, the PDF acts as a link farm, pointing to numerous URLs hosted on potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://hotspot-usa.com/js/upload/files/tofovepidozexikulujef.pdf In PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/440058298a1c40e10b1099f1d0a1400f/tutazeb.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v83181ka6k6keage50pq806699/50737842399.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a360841af4e---54682805939.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/59154264149.pdfIn PDF document text
    • https://x-software.cz/data/file/tojadajedobe.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d83575610601b1a7540e5ea96769921c/vixamut.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/genirogowesotidopomewarej.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/32871459749.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160910082486a0---kejabixepiwidijosekerixu.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/jijozosugizezujis.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/vasupeguxurevuvu.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/irfmusdnc9eopdsr5likspmg4m/zufidalatoxesemaruvodo.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ce242d02---buzujugudeneno.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/birigekivolateko.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/71973091177.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/zafumise.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/92389e846f02cbc46772da64dc549474/gutaganinawe.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c744625e1ea---mabodezolilo.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/wexojegagukazob.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b9629dbc---72226905653.pdfIn PDF document text
    • http://exima.kr/userData/board/file/34415730932.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071742f8799e---26529268914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=no+cool+air+from+acPDF 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_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 9972 bytes
SHA-256: 9c9cf4f7227bdca394ed36be75216b9df7b3fb323c06fda985108263a1b86b20
font_02_sfnt_off00012128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12128 17540 bytes
SHA-256: 9a641d989c278ea2bdb81bf51b8109b667e19d7368c2251e859bbc78b0968208

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