Malicious PDF — malware analysis report

Static analysis result for SHA-256 def1729570431428…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 00:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b8abca560a2122bfefa44e88f00ec42 SHA-1: 05fbaa8077a492116d805df642c8e6ae2ea6435f SHA-256: def1729570431428e1e879c5f51360fbc0d94ab8db70c082ee802aa0e86aa823
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://sallytour.com/FileData/ckfinder/files/20210912_EE5342A868559865.pdf In PDF document text
    • http://tinhdauvietnam.vn/upload/files/84487836671.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e4c4f64e---76880749506.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/81684267341.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/famivolaraniwoxamizuvu.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/puwewowupo.pdfIn PDF document text
    • http://apismorava.eu/docs/96892570250.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/xaveverixidigojimofiroru.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/mepemumafeze.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/21983367181.pdfIn PDF document text
    • https://maisonforville.be/documents/file/fekafatonovaguzelovogotaf.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614510cd584f2---44569872674.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/f161271e71362bffbeed6f1b77b1d50f/razarepejovevenuwopuvo.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/kidule.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/jefimuxiw.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/mepukerinipirutimerite.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/tomogosikugofidera.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9401877f0e32b931f7daf2cb973a867c/62570017747.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1d63c84c2---6820460132.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143282960986---vomevokevijig.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/68056178450.pdfIn PDF document text
    • https://rotitelor.com/contents/files/42262885721.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/numidexekofupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=clear+history+shortcut+keyPDF link annotation
    • 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_off0000f182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 17928 bytes
SHA-256: ae31a6eb2082e78d9500690fdb05c33ada1a2f4a9efc61e0d62fb1d14bc0e9fa
font_02_sfnt_off00013818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13818 10560 bytes
SHA-256: 2131e79439f0430ba99d3d0ec2702f33758afe738a0f86b24279e4ff2d4094dd

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