Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c3493a2ad24480…

MALICIOUS

PDF

78.2 KB Created: 2021-09-16 09:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 24c21d9923ad433e396f3f8b939070b2 SHA-1: 7c16b8b8239f87837fbcf25d410dff00d710b638 SHA-256: 25c3493a2ad2448067e9a5bf47cd416ad97ed140b329ae9326a2bca6fd3b1351
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9c5877f13ae10a783ce69002e2808622/vijud.pdf In PDF document text
    • http://techcessgroups.com/userfiles/file/kigegezimagefubofukaxef.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/wizowavolalosaniri.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/36709614845.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/15726742038.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f8f28c12e---5498430509.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/tanunoj.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/83508612268.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/11549799568.pdfIn PDF document text
    • https://areicon.com/images/file/37146509235.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613f337e1c2c6---janaboxumesepaxedum.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394c3fe20ce---mizudagubelokalugavufo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bfe47f8b4---kedofopaziw.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/vadidozoluxuwizoxeta.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0777831bdd7030ae16991edc4c576ef3/97984549678.pdfIn PDF document text
    • http://brenderup.ro/mm/file/tupojezapozojedozivot.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135cdf179261---bitezosuxesubuju.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72ad191781296b2cf25dd00623749a2b/44307205115.pdfIn PDF document text
    • http://talleresjpg.es/img/file/fufunokekobalewiwodif.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/fitok.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/cdbd8f7eaa54353210dd47c15a9e6021/vasalikebozasugu.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/26083511264.pdfIn PDF document text
    • http://drironcat.com/images/file/rivotonev.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf7ed84dc---vijirow.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/20198794899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=dustoff+heli+rescue+apkPDF 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_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 19192 bytes
SHA-256: 904f9a454aef8c6376a37caeb3377073d941964fe78c66abd829fa4fa1e77570
font_01_sfnt_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 10664 bytes
SHA-256: 8f074603409ad219619c8f408c0d416e1c06e94434d96c228340ae58402ffbc4

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