Malicious PDF — malware analysis report

Static analysis result for SHA-256 330016f13bd94b6a…

MALICIOUS

PDF

91.1 KB Created: 2021-09-20 02:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a5237eea4fb1f1b693b9b89578877ec3 SHA-1: bd95ebdb5e37ff8de67d88d12e08857cf5e9fbd2 SHA-256: 330016f13bd94b6ab6865f38125d92593c8b71ae8758c4c9ca684fe46fde9eac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=the+best+launcher+for+android+2020 PDF link annotation
    • http://freetds.net/userfiles/file/69039122012.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/29706940130.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/xipanevarupewajiw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136314967fb0---94383474017.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/bidewekakofowimojove.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/jugijaf.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/kogipomokujutogubijufuma.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/sikiwitusubules.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/59670540711.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/tiferesexivi.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/96735358930.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/sijimesedazimaxibosubi.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/koziwuvuzevuxifukad.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/s9n1m0b9qcd6s8c1mido321heh/12050894129.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140f1c36f600---jonesimilajarowujol.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/xotexituvup.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/gupajisuvifinugot.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109131123477937.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/bimigupolet.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210917095041.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/robira.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/62268358928.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/perelajevetezetoza.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_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 11020 bytes
SHA-256: 7528affbaed57b463200bab3c716d4ba32bc6c71eb5a79e9204a8a6a77bb4ca0
font_01_sfnt_off0001186e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186E 18156 bytes
SHA-256: f00276d5407ba02a6c2f8b8cb09fd54ef9462f5fc396fbefe1ed28273dceee4a
font_02_sfnt_off000146f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1