Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d28a06ff73bb54c…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 00:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bf426f5b7cedbafa848fc3dac4a11a6 SHA-1: 26a6e4c04e06cb3d7e04e684a5a2efbe2bc3446a SHA-256: 5d28a06ff73bb54c6e4c024c598147663f8af36393038d5523cfe39cff552a39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate a link farm designed to redirect users, and ClamAV detection confirms its malicious nature, specifically flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://triangle-electronics.com/assets/userfiles/file/xazabebejesadanuvo.pdf
    • http://rayocazar.com/images/elfinder-1.1/files/file/xumakurifujolipuxinesip.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/51776727461.pdf
    • https://noble-program.site/js/ckfinder/userfiles/files/rujifavow.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zakenudodoj.pdf
    • http://suachuamaydemtien.biz/userfiles/file/78446111849.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/474603db08b2c6af6e1255830cc51613/baxixexatefi.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139265b3af06---8029674116.pdf
    • http://singer-island-condos.com/userfiles/files/8517426556.pdf
    • https://krygina40.ru/UserFiles/File/87106506488.pdf
    • https://drisraadentalcenter.com/userfiles/file/gefafogofuti.pdf
    • https://booburger.myagenda.cz/pictures/editor/files/merapipev.pdf
    • http://auburn-properties.com/userfiles/files/29328540868.pdf
    • http://imi.vc/upload/files/datotipop.pdf
    • http://fzcce.com/aimgs/uload/files/refuzodewudunubepabapimiz.pdf
    • https://horacebatten.com/ckfinder/userfiles/files/21247337191.pdf
    • https://kaparatt.com/images/File/97526672412.pdf
    • http://mlsy.cz/images/file/files/dovagutuguz.pdf
    • http://obkladlazby.cz/userfiles/file/60052044919.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613498b09f60b---fepakopu.pdf
    • http://ediljolli.com/userfiles/files/dujusujejetaredajeni.pdf
    • http://toyteepee.com/uploadfiles/file/210907115300301843djongp.pdf
    • http://dalboncostruzioni.it/userfiles/files/gebunepagejewinuvubexeris.pdf
    • http://evpltravel.com/xv_image/file/bitiwagejusewegagebos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+should+i+eat+before+gym+in+morning
    • 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_off0000c091.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC091 16792 bytes
font_01_sfnt_off0000d8a8.bin
7b28a1a92c5e135f9180c3657cacbb8ff11551e47a4ad0a5065924a133fb2405
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 11148 bytes
font_02_sfnt_off0000f257.bin
d91e0e52e133e0360c8149e75a11e622c3eb7463fc3e858e08be1fcda47fb35e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16768 bytes