Malicious PDF — malware analysis report

Static analysis result for SHA-256 8036a39893a966c7…

MALICIOUS

PDF

82.6 KB Created: 2021-09-23 18:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4448734c51e3decea90ded440ca59317 SHA-1: ec7fe1cd23e6104cc8fd0b588fac6b5b9f8c6bcb SHA-256: 8036a39893a966c7d689a5ac34c971c030d311a536b16b069e417e2d458d94ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, suggesting an attempt to distribute malicious content or engage in phishing. The presence of a compromised CMS upload link further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://acavacecio.it/userfiles/files/jesunenugebukupugijapan.pdf In PDF document text
    • http://bassonconsulting.mc/userfiles/file/15652904352.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/64081731814.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a8690628e27b3c01b7c2007b71ecbc0d/54903816547.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/47634715180.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/11542531074.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613a14d62637a---79809521340.pdfIn PDF document text
    • https://j26clean.com/upload/files/20320661203.pdfIn PDF document text
    • https://denimder.org/resimler/files/38220109890.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/9998555818.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/dupomipexujono.pdfIn PDF document text
    • http://gapp.fr/medias/files/nipigovinupapibarujad.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/57984264616.pdfIn PDF document text
    • https://aksusu.com/upload/files/rexudedivikubagu.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/rebalowupaba.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/makusadama.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/18614752841.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138060de2bbd---kuferikolenemit.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/lemidirapaluf.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/55040320169.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/wiletaxadukadoferefilubop.pdfIn PDF document text
    • https://songhongresort.com/img/files/23475264210.pdfIn PDF document text
    • http://geodez.com/pliki/file/bifemopuvuzijitenepijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=wii+u+homebrew+gamecubePDF 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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 10580 bytes
SHA-256: d09974e7551dc1bf14ebef323ae47001d5c5ae81444b916b741d49c5b12db2be
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 18416 bytes
SHA-256: 2649be1d36012450b30ff15e9664bfe20fd1552e539104dc61a9b40650d531f4
font_02_sfnt_off000124ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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