Malicious PDF — malware analysis report

Static analysis result for SHA-256 6779efbc789d0094…

MALICIOUS

PDF

89.5 KB Created: 2021-09-09 19:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd2761e93c49aa1974004c0a98314736 SHA-1: b13cefce860d5d51dd597b5d9813bdc165215380 SHA-256: 6779efbc789d009435d886d9e0e19baa0d5c56ed3b9742c43583d29f3ce5f5e2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://bogaarchitetti.it/userfiles/files/rutobine.pdf In PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/11885742063.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/54122688060.pdfIn PDF document text
    • http://congluc.com/upload/files/sazirilorenajigu.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/pawafusinobofigawumoses.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/4044700ca12fda7056db8bbfa62d0496/wafafobawopiw.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/41628750657.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134d60f0fd41---7121389029.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/xexijimoxogukud.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/jowidatibumum.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/24704535667.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/54220343562.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/tulelumuzawawiranax.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7d8b1e6cc---belujorevakuxojulo.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/94578759335.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/18f66abdc8bf000f8a177497673ab5aa/luvowedebezopuzu.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///73344230236.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210904195434_326642694.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/56044522810.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/pirajetovininivip.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/sutagopagovimubofuze.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/rajezigivi.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/64738206485.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/57780661276.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908031942.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136be8a55dfa---11529877518.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/topev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+online+movies+printPDF 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_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 10696 bytes
SHA-256: f55b0e9976257b4403a1c8e82e988c24f424641882597aaa90b809b694ab7c0b
font_02_sfnt_off00012a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8B 17820 bytes
SHA-256: b88a0af85f6f444ad0199adf1a5dba5dfe71ca215a9e568e8150fd549acccc3e

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