Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0285ee29337c6a…

MALICIOUS

PDF

71.3 KB Created: 2021-07-27 03:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7e225ccb9d2dd7c96ec30e09c75c3130 SHA-1: 4979008ad70c1931d77350166f90e8cdfaef7fe4 SHA-256: be0285ee29337c6af68451b1dbde78debaa54d0925ff9ede3479349c04081875
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination or evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allmedicus.com/userfiles/file/16648001202.pdf
    • http://www.blueoak.fr/image/file/zekaxorijudunawidadobo.pdf
    • https://tmtteks.com/files/fowukugosewebul.pdf
    • http://suapaiatuipelehakefamily.com/clients/80707/File/56098770345.pdf
    • https://artasedanasingaraja.com/uploadfck/file/38318727483.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/93330460971.pdf
    • http://designbeginnings.com/upload/file/36782083823.pdf
    • https://liniagdanskzydowo.pl/files/towizosove.pdf
    • http://beachhigh65.com/clients/879402/File/jitimevurogesi.pdf
    • http://nousgarage.com/userfiles/file/zafew.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/18dd717ed32103d66774c2b31fb3f2c5/64520987595.pdf
    • https://loyallcanada.ca/editor_files/file/vijifejedoxilut.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d7c52b220---18837902816.pdf
    • http://ccswcd.com/userfiles/file/kazoxorala.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/078b2b695f720fef7c89b72f4914676a/mumipuvigovofezom.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160796be1b7563---99210643108.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c5b109c2991063fcc6fa4dc5796bdb34/21042947523.pdf
    • http://forglory.cz/ckfinder/userfiles/files/5598179655.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abcb46e2f60---duxugazabigipunuxanesuje.pdf
    • https://marathonlaval.com/userfiles/files/sumij.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/20008803595.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff5915a35---35002461878.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e2436b7c250bd286e0a4c5c0b5cf3be0/ladaneneni.pdf
    • http://dailymaydemtien.com/userfiles/files/sobif.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=craigslist+flint+michigan+tools+for+sale+by+owner
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBA3A 16792 bytes
font_01_sfnt_off0000d251.bin
b8aea1ba35c872d12f76010dfae66ce5c86150ba0f9f92901f9114de15263b12
pdf-font-stream PDF embedded font (sfnt) at offset 0xD251 11156 bytes
font_02_sfnt_off0000ec48.bin
99d6140742bae67413f609f81cf78797adec1872ed2f3b2e2cd9fb119d0c7b35
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 14148 bytes