Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd80e3b172cf0dd3…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 05:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3a6576a510a32921944bb627c132973f SHA-1: 86f0de8dce43f22a79ad49f985dbd6457d49758b SHA-256: cd80e3b172cf0dd31d766cd3c3ebe8d5720e41bb25f2ef9012d82f08a025da34
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript, likely intended to redirect users to malicious sites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://binarbaidservices.com/public_html/userfiles/file/kofaxexe.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d809b5179a---79694155516.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b96435929641e1c01c286f10561b4d0c/73706388475.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xuwov.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/49049314259.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ja1qsbn1a5d4r6lsndrjl3qiq7/16307099540.pdfIn PDF document text
    • http://dwhs79.com/clients/15834/File/ziletipusugegebujizi.pdfIn PDF document text
    • http://446888.top/userfiles/file/33614972648.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa890bca8fa---67623375627.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hjlef45iq7s4dguoen4bn29ahh/segogobexan.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/samudeledupigudaxagopor.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a64786d1357---pegapiwixe.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160da00d18cf99---38467909227.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0501b58f3---wudapumedigunefon.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20217271442464676.pdfIn PDF document text
    • http://deauville.ru/files/file/38803559871.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/romifeminopekab.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/nalopokekeputiruj.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb89cb2649---menaw.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/jigafalisijekexovev.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3462e65964b25ffbd70998ac6647ae58/wesotokutikunuzedogaf.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbd8f9e75b---bakebalegamaraje.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/mobuwedexakivezer.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/70761446958.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/wigatoluxal.pdfIn PDF document text
    • http://jkohut.pl/file/59974687425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sony+dsc-h10+camera+manualPDF 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_off0000f068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF068 10940 bytes
SHA-256: dddf2e39dbc0e52fdaefa89589becdda618adaa742bce6a59d8965c28137e5c5
font_01_sfnt_off000109a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A7 18192 bytes
SHA-256: 54027c8e5be35fffa12806655024a1a6195d3e83982d7cba2acad64a389b8159
font_02_sfnt_off00013913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13913 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1