Malicious PDF — malware analysis report

Static analysis result for SHA-256 709c779f2b7cc8d8…

MALICIOUS

PDF

67.9 KB Created: 2021-10-04 01:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 46ed51d6e464d36870eb00a3e735a6a0 SHA-1: f7efa4f217bab567cdfcb1b8d3d6c2e0637210f6 SHA-256: 709c779f2b7cc8d82e4a55364c285d36d4a496a044fdac3f9f5881442f71f4d2
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 embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The presence of JavaScript and the link farm suggest an attempt to redirect users to malicious sites or download further payloads, aligning with phishing and malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://synerhu.ru/uplcv?utm_term=interview+answers+why+do+you+want+this+job PDF link annotation
    • http://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/42102184021.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/51204201390.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/23174744431.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/wenerit.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/59836888660.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/80109769583.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614278b93a1c8---20421261369.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/4971640642.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161370b68e75d8---vowevorikogotulodaza.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/bonajikefarobomeravuke.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/poximenixozagorulavizefe.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/mejov.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/15708549033.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/80386731759.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/77066032328.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/gezogoruvopuvovo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614eeb5a71836---14605187720.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/2710804784.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/luruliwenagodo.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/debemaxiwor.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/46554483247.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/52825966246.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_off0000ad26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD26 14480 bytes
SHA-256: a57cfcae3f19402d3b396535825cad0fedc0a979510b12a486b389ab19cc375b
font_01_sfnt_off0000d12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 10884 bytes
SHA-256: 4a02abed7b1ef000e26a705dcb5ecb4aebbca11dff644e1c2171df7b47d4ca10

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