Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cac2ba7de620ce…

MALICIOUS

PDF

79.9 KB Created: 2021-09-24 10:21:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91e00b453c0966710de8cf5142146890 SHA-1: 9021dae3434ec05bfcdc0444b5661cd40c05f827 SHA-256: a7cac2ba7de620ce10dbf616e2235ac88cd580a34331b4206b578b169a4b1d7b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://oniceh.ru/uplcv?utm_term=soundabout+apk+free+download PDF link annotation
    • http://sicilyontable.it/userfiles/files/50058970168.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/40232590858.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/6848038110.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/35344635339.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/906020524a3c9eb8dbbeda8a0d2ef138/91642473316.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/6999691156.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/gutuj.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/56889760611.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/bukogozesusi.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/md59a19003904rpuj33ce8ul7c/99747613580.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/ledizedo.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/49295841986.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210907145552.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5283aa8d0---20255004814.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/zedilaluzupivijod.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/46908797041.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/dawevoluvojotazunipisa.pdfIn PDF document text
    • https://tekartltd.com/upload/files/55948299228.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/5568816127.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/4646446557.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/14a28b7416c7ee603c71345d62c2af29/lalemegetulafugidelufuwu.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/74040703899.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/9600247612.pdfIn PDF document text
    • 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_off0000ced4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 10724 bytes
SHA-256: 15b4a2659cc2f048f5f56db1d32aa38a0f7206dc5f159ff4202834a1343780c4
font_01_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF92 19368 bytes
SHA-256: e54999dbe04807ced5ab6036499228084533ed9206c28bfbb0f661184e04245a