Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd47e70f626eb7e…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 19:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b50b5e632eeef4ec60086f991fc9b83d SHA-1: e3caf5e4d434617adf36ac5ec0c926adf254b129 SHA-256: ecd47e70f626eb7e28225e58a0505216e98e787678766abc00db8b9001956a79
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=wod+werewolf+the+apocalypse+pdf PDF link annotation
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/12085242580.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/60382360244.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/4o7t01u6cbcirbl59b6k5ae7aa/xejakipik.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d51682d5beda8871746f48e744a48acd/14924482164.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bb84d72440db71e3b0e8aca60b3092f3/kusaboni.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/daxuwesej.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///76528598133.pdfIn PDF document text
    • https://giustofiori.it/file/sajakezuneja.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/cb1209ef14f9373142d0e661c6e53b9d/felisisegekulamijugap.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/83385205016.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/75540596834.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/metezu.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/feregi.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160879c81b370b---76057642026.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7a5e0d7a24---10251192464.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/8155603387.pdfIn PDF document text
    • http://licausi.it/userfiles/files/25298998514.pdfIn PDF document text
    • http://xycrusher.com/d/files/gedaridukur.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5843d1043cc9341ba2388ace5a55755a/fekujobozojudezupigure.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/b4k866sms5ji8hj367amilbob6/29343504656.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/tifolikanu.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/roraberekalisinanepoxesut.pdfIn PDF document text
    • http://kleiberit.ru/files/file/jerinasafusitajigexunof.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 17960 bytes
SHA-256: db18578ca18f1b588a6d21d74a43c42b6b6d959eb61f5e547d9b1ba1647bfad0
font_01_sfnt_off000103cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CC 10712 bytes
SHA-256: 5c746d764999def05c0cc2ae482a6da0dab50340bcfbc3d4011739c1d688f74d
font_02_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1