Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc909dc60715c33…

MALICIOUS

PDF

78.3 KB Created: 2021-09-03 05:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a0667eaf6820ac7a1e81cd0d5ce9abc5 SHA-1: 0deb6482afa2d4c1be1f3b814b907510b60631cb SHA-256: 4fc909dc60715c333a49d05162b1d047a15e285b93cdc32946935b88c3c4a172
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised CMS upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on disposable hosting, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content, further supporting the idea that the document's primary function is to host links rather than convey information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://vtaky.sk/media/file/93964607253.pdf In PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/zigaxevejisezawovavejomuf.pdfIn PDF document text
    • http://ingore.cn/upload/files/41062092083.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/ravibewoka.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/xaxosuxaviwejo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161312794012b3---35879119184.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vanojunowiv.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/20401751288.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/betuwulafexi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/20330585280.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ueq0ncfbl6sn29mjk19s7vr51q/tefiwemakukukeziwezugegug.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/xepolenoxokafasenoxefor.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/jovurusis.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/pezivupapuvidone.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/87100722836.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/bogokogamarud.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/folorejajesujilibogado.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879895de73---terav.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/4566845795.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/kovowu.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/lonexupamipukoforoperut.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9363d4826---zigurepute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reflective+teaching+approach+pdfPDF 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_off0000cf0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 17008 bytes
SHA-256: 6478791de81d9d046aa24f7800f830b0dace02ecb0e9a827f6a5607b6eb8aef7
font_02_sfnt_off000112ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EC 10844 bytes
SHA-256: ab6a2f21ec6e6d21730ea284f8ab4c578e08d470c78bfdf5275cf6c48929588d

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