Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c921abcfc88760…

MALICIOUS

PDF

84.3 KB Created: 2021-09-21 07:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b03168a342b8263cfd4812a8d31624de SHA-1: b0e1c6847df4f26d111c472e6f3edaeecd1257d0 SHA-256: a0c921abcfc88760db33715601628767ec4abbd8a83fd801501d35433ae9640a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to lure users to malicious content. ClamAV and ML classifiers strongly indicate a phishing trojan, and the presence of UTM parameters in some URLs further supports a phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://ecohort.com/userfiles/files/tevilozoruwisedofub.pdf In PDF document text
    • https://narellesastro.com/userfiles/files/lewunodajemowogimazexe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb42152fc7---xisedifovu.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/xawozepez.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/38841751691.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/64810416096.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130d2f76e766---mobonurekebadosumaxupegi.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/41808515492.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/f62d47b24628a5fec38d02fd74e97278/rewusi.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/89393038157.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/34805796470.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/pufakerovepotel.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wutefeda.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/vugamajodobewofukibesuf.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/41367751941.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd67aae194---taxonefuvozuli.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/78160867224.pdfIn PDF document text
    • http://seamacros.com/upload/file/77563791105.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/10669689344.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/56072781910.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/miwikugikamezob.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8ab35e782a390fb19878d9e1fa569665/bewesetafalapofixu.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/89755488992.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/nidelewenugemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=apk+mirror+lucky+patcherPDF 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_off0000e1fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FD 10652 bytes
SHA-256: ef7a71d8709bbf08fba3cd4c712ead191a5467d5dcccb67ed91eb1b5bceb8d48
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 18752 bytes
SHA-256: f6f53faa0cd4e44b6ed84c37c2aa3f7f3c6fde41fcd7b8b564f65318620b1294