Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7a8b3b40c76855…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 01:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c4e9ad6bd56593f5546bf4b6f2c0909 SHA-1: 48051253056ab471f724895ba61025754f6d3386 SHA-256: de7a8b3b40c768550823c6922e14f95ac036b6ada5b60f0ed376e3d8b0551f3e
176 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and exhibits characteristics of a phishing lure, including a screenshot disguised as content and numerous external links. The presence of multiple links pointing to potentially compromised WordPress upload directories and disposable hosting suggests an attempt to redirect users to malicious sites for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://pixomot.ru/uplcv?utm_term=lamour+premium+hacked+apk PDF link annotation
    • https://aep-tc.com/cache/fck_files/file/27119816560.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210918165603.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/vilefulitago.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/vilirevukiluxosapinaluki.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631089583.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/xesowofekukas.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/pewemubidewutomuminix.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/monupajalelinaris.pdfIn PDF document text
    • https://sadex.pl/fck/file/losowojataxem.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4c34270e2---nugofogakutukufuk.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/18403543241.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/580411741.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/labolomurefikolugeze.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/bajolaj.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/nabosigosida.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/topolazifumo.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/69033689605.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/lixokemolow.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/37866529197.pdfIn PDF document text
    • https://jobtiara.com/files/files/69727565871.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/492d548aebc090cf15eeb38175e3072b/matimovo.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4891a4a92---42042463544.pdfIn PDF document text
    • http://a899.net/userfiles/file/nilikox.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161505d997eaa4---45720477346.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/78878173288.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/nimusadowimaleziligavop.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xofoxowizokajididedevumin.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_off0000b5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BD 10512 bytes
SHA-256: a997229820ea6efbb133dd1c681cb488c6f896e44a6d90e5a5daf9f7f8a95ba3
font_01_sfnt_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 14672 bytes
SHA-256: 71fa6f4e0b50c36d714fce7ecd3e0fe06781277ec8c1630a33ae83eba19a833a
font_02_sfnt_off0000f24c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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