Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc330539c36741bd…

MALICIOUS

PDF

101.6 KB Created: 2021-07-03 01:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5019da8ed581dcc34fd4cd94ba41c5d8 SHA-1: 1e7b6241ef721f2636ec20189a13bd9c760f6d63 SHA-256: cc330539c36741bdbc33525bafb12f8fb8ccf8ffc1f160226f33df6b3228944d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external URIs pointing to potentially compromised websites, likely intended to lure users into clicking malicious links. Embedded JavaScript was also detected, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://queure.ru/uplcv?utm_term=how+many+valence+electrons+are+in+oxygen PDF link annotation
    • https://amitadevnani.com/userfiles/file/85721661586.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/98490874001.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c659712e1f2a6aa36c9a5a326ba615a8/36434534957.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e4ed84162---zofoju.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/89891581301.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/i813gc82mgk2havheq50uff6l0/3094582320.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5691cc873c737bedc10fca4f0f186735/ravalalivaforojatoxep.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/cdc71ae1b6dc34b6993c48e1e21ff928/96141081401.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/3550b75edaf1069b48ab3b597c0e0795/61615435706.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/nskb50soopt0iard8g55fnrdib/98625007812.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/jerewinelopavoxepofak.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df5f34bd6d---wexanedivoxasavuxisixifo.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/dexaxanalumukepowudup.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2098b44f0---88658505390.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/peboxekibi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/11460432264.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/23643672728.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/23487026076.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jan1tdll4p70i03f0fiha0ps75/jigotorimiwi.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7a1ce9e0f7c78262fa9e7247b31485d8/51188701317.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16223011860789.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_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 20112 bytes
SHA-256: 588a78f7ed65d42552b35391ad345d614a5f212ce4117b815c376c21aa47e51e
font_01_sfnt_off000157a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FB9 10932 bytes
SHA-256: b1943781bd6e7249cc1986021937e58131a247f607f191add834ce115dcaf9e7

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