Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef520ea1e34131af…

MALICIOUS

PDF

88.9 KB Created: 2021-08-14 11:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1179e297a8f99fa76cc2f8568ca69312 SHA-1: 5bad6446741149556388dbf573ace046e5e89fd0 SHA-256: ef520ea1e34131af31255fa7e05258515bd34d7e401f98ab48e65cbb5d318c01
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to malicious content. Heuristics and ML classifiers strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The document body is unreadable binary data, but the URL structure and heuristic firings are sufficient to determine its likely purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cructi.ru/uplcv?utm_term=como+fazer+identidade+falsa+para+facebook PDF link annotation
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecf6e2b6da---lalubozedupunano.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cae20b341f---tuvejerezolarujebapuk.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/futisodorabaletavuniporak.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eb92ab7f7---29793174312.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf5ad0c388---zozifafojulomikow.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ff53d6223bd66ed808aaea826e371ecb/tulupurig.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6fad9fde8bc4e15f21a096b505b64bf3/fovodimirolef.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5016f01fbb---ritojewomomogele.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1611521d7b2fc9---43891834490.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/44313798169.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/30012377045.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/95038315935.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/242de6a14f2087cfc4f7354dd72f119d/donidorazabidaruzifil.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/96173520204.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/tupesorepifejanukuxo.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/f2ql8qm2shpbb33knp77mbj8c1/43550056440.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/87995365938.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ahrdbi8s1ie9olrfuboni7b4d9/wifizalinajevulelapaxa.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/74502878705.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/525ac41fcc5ad4ab92c19aeb9d9c68e5/52420931983.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8c7bb3b66---13893114688.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_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 19868 bytes
SHA-256: a310f669cb800b33d214844530d644e2b06a4a997f899bacf957fc8f38569656
font_01_sfnt_off0001211b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13932 11104 bytes
SHA-256: de889cd53882407dd45be9ed4819ed3d5ca602c8d48cd6d7410b3ec83e7bc533

Open this report in the interactive analyzer, or submit your own file for analysis.