Malicious PDF — malware analysis report

Static analysis result for SHA-256 8759b25b9dfb7703…

MALICIOUS

PDF

91.9 KB Created: 2021-08-01 00:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c38b438f4e62c59d38b973635187bed SHA-1: 782e740258dfe11fe3e6bd7890ef3d559837d2b5 SHA-256: 8759b25b9dfb77038db91a43d0b3183eb34f4f2e77475b4ec58d46b26f90bb14
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The embedded JavaScript is likely responsible for initiating these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.escon.it/wp-content/plugins/super-forms/uploads/php/files/cc6815dbde2a56e5040e273daf031c00/mapejowedamunagu.pdf In PDF document text
    • http://taxicityplus.ru/userfiles/file/52324247319.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/dupovixativu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a61b26441ca---41069560352.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/68844721986.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b28b1ede9---wusizoxepisoba.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1jeot4m12o1c0hvueb0hi8gc9o/jokaruwebomozoziraxaxesu.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/62277949243.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/nefelanigaxijusirem.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/b61fbc6413fdcac950741c2124e4e6b1/gigem.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3d9610fe---vezusorowutogaku.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/17047270888.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430153532726763.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1e63d9ac0f0547d788dd0686a801a40a/xekokuxego.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fjbk7siqi1k31atdo5pkjgq7c1/rujugejijeti.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/6e80c7b3d6ba8320c5ed3d8f9c95b1b4/61543626895.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ea889655---ketabebarax.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b210be3c14---josedalo.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16105ba3b2d34f---tenugalorurerawe.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/59327888844.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070306032622.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3184cb7093---7755178968.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e05a0eabc6---53741115970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=baby%27s+day+out+hindi+dubbed+movie+download+filmyzillaPDF 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_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 17508 bytes
SHA-256: bc126e92c0101aa7eb09f63ad6986293338b1f2a3f3e382757732b0d480f4a76
font_01_sfnt_off00012dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEC 11172 bytes
SHA-256: 04cf08d79fb91845c61858e43e9ad547c50bc2ba86ab8abd7b690aa9b1f348a0
font_02_sfnt_off00014809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1