Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9e98fe1c659a93…

MALICIOUS

PDF

85.8 KB Created: 2021-08-30 15:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3125c62fea43d1f866edfa00ea867abd SHA-1: e42bfb9516959a0ae7453cd37aaac134e20165c9 SHA-256: ff9e98fe1c659a93c373f032d1d7f9e2b365dfea2a09527511943fec7b5ae3a9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage, suggesting it is designed to trick users into downloading a second-stage payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=engel+physical+chemistry+3rd+solutions+pdf PDF link annotation
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d171773114---latofijubatedemox.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b152a31c57a---9108903231.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/tt31g45p5ffjkqkr587la0ah93/bujexufifawonebofivemu.pdfIn PDF document text
    • https://granitnet.hu/editor_up/ruxugofoxutodusu.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/44h7fs7tch8hrvle87kn86lmen/mutig.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/xanuguwu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610add90692c3---30348202238.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/76402044795.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/39895433888.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/vqo4fs814o5k6fhr1vatv06he5/13956125873.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/53746936994.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/zekadawa.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/42324188975.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021530115622211.pdfIn PDF document text
    • http://geasit.it/userfiles/files/mejekofiwamakeponab.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/83375659602.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/golinegodoxopuxifil.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021072715043097.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/17950453104.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63d3933e7---7552357376.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/70178596785.pdfIn PDF document text
    • http://sushi-belovo.ru/files/10119011537.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/meribizutusopepodukatifo.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/63320056829.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ddb9d73defbcb7699e15aef26bbef537/gixugigiwesaturuduw.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 20148 bytes
SHA-256: c487a3212ba258a8542b02028a1afb0eb97d3644ea2b2e1448b0466f5255ebf1
font_01_sfnt_off00011555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11555 11436 bytes
SHA-256: 2e60d515e9aee2e18eea2e8d1d16c97768582ec264dae8b9b028438216b1bc9d
font_02_sfnt_off00012ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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