Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6be7a93c67a9bc1…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 22:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bd1115141a260279c27dd74535bd12ca SHA-1: 516a7272573b2f244a5ea89f2acbf2438a1e47e9 SHA-256: c6be7a93c67a9bc1bca7c46be9a70de7e7ea7d2d886f618097fbcb32c9c4d671
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2687bc52---nawizopimixipilaje.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e8cc447e0---zunutisoj.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/62212463744.pdfIn PDF document text
    • http://datcat.vn/2018/file/55108885539.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a634194b877---14213517283.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/89283592724.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/jagukatabitomumetewafe.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-8/20210608085317323319.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/93029125345.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/92335900379.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/30470976029.pdfIn PDF document text
    • https://dhesient.com/media/20628444460.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed48a0fcf0---komefixate.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/ruwumikosekomedes.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/wovikufefunafolaludaji.pdfIn PDF document text
    • https://wittnebel.dk/file/fofopebegigip.pdfIn PDF document text
    • http://tipiland.net/upload/file/rilevez.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/gutubu.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/8088471910.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/o37rdk2vbnhar8drruivd28gp0/13127147352.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/55350636142.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/4161037559.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/58317693411.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/guzikilexizoledaroxef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=neoclassicism+literature+characteristics+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_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 10860 bytes
SHA-256: c8bb7eb071a8de0ad373b9fc7b758ed583edcdb3d0f1483a94de83024bf56669
font_01_sfnt_off00010abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABE 18892 bytes
SHA-256: 61a9b36e25335191bb7c052387538b8567c852d665e626d3fbb6223ea5054965
font_02_sfnt_off00013ba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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