Malicious PDF — malware analysis report

Static analysis result for SHA-256 7088c4f75d2ab615…

MALICIOUS

PDF

98.4 KB Created: 2021-07-04 23:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d150f1950adc7cea697260537aba2553 SHA-1: f5f171afd8f53ba3a52ef2f02e6aac010a078c01 SHA-256: 7088c4f75d2ab615f85858e08a49efc4aa237a9e345c83248a3f6db52db801ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • 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://ridendo.cz/files/file/ribevorevefuserevafure.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074297dec4bc---notogazewakadozozepamufu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/46137890931.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf65f3875---rodux.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/jawusedaririvupalase.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/83722866245.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/10808782187.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/bubezunasewi.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607766475ebc3---60041354014.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/jinup.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fc31b996f62a3eb1d43a3373fac71ff/pozowiwosipawujurujum.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/jb6vro74ao582v67g69lnti259/wujadedirobeseguwuw.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d47b19dd2aed99098299327e253d9fe9/borufixapezarerinojoz.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d2320135e4685a9f53eff00d95edf5e5/36780696794.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/11105bb8669a4bced58de42765af0241/xobijazovabudi.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/fuxufowo.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/tirunew.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9868fa37f4---gelalosa.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/0a99ea99fabf441c209407a439fd2412/85415783392.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085922a14488---kivirubar.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/44850057762.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/28b18ad9a05c30b6bf0fa517a6c62092/favosizusitenetaxap.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1260faabd3---71265472072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=metro+2033+trophy+guidePDF 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_off0001206f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206F 10812 bytes
SHA-256: 6821e92c522403930600566b0d2e809f3eac7890c03f37bbe2faa8678b2d72f3
font_01_sfnt_off00013962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13962 16600 bytes
SHA-256: 50cb36c7713edf91fb3a280d68451ebbfb38f8bd17759c90521a88106ddab7c6
font_02_sfnt_off0001648f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1648F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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