Malicious PDF — malware analysis report

Static analysis result for SHA-256 289d411f2ee12b35…

MALICIOUS

PDF

76.7 KB Created: 2021-09-09 11:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 61104ad5894462452a2a8add5508e947 SHA-1: 2d2cd608e5b16c4119e1c0e623c2fa5277a3789c SHA-256: 289d411f2ee12b3544344ad063f9df05210093e2c6f59c94f523309569736999
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=twd+no+man%27s+land+mod+apk PDF link annotation
    • http://mitcostruttori.it/userfiles/files/3531400263.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/61924374588.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/ligujuwekoga.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fifa7opm69k9u1s2bmjf67ih3/pokigibibamex.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/filelibejotibo.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/daxefuzotowojizulovizop.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/66622160934.pdfIn PDF document text
    • http://hk-keber.de/images/file/badutazomo.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/62090422603.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210906031350_812632.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a073d7def---gopilubawedikotavizop.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/vedawoxibisaporom.pdfIn PDF document text
    • https://irantruck.ir/data/file/30292905100.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/jiturovumezutotogofi.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/58865505065.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/72449776961.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/xigavur.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/89803348352.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/jotexosok.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/83388207598.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/94645244271.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/29968117189.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed5023cc0---55372900524.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/xiviwefakofimuzeji.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 10308 bytes
SHA-256: d1a8a28294721a0c122b1baae364f1ae145dd0a1445b54294a73a0363b24ce42
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 17720 bytes
SHA-256: f5e82ca6ed750501ea6455a204bded72d00d39efe3ff50984b5dff3a154b0d01

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