Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddffa2c711620758…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 18:24:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1fed958c2951e9c64645128d97411d63 SHA-1: 41b1f25702583e3c024256ed0d6c27f0dced9658 SHA-256: ddffa2c71162075879e0bd2adf48af6321772b7ea38f88f5fda097f20103de51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many hosted on compromised WordPress sites, which are likely intended to direct users to phishing or malware-distributing pages. The presence of embedded URLs and the nature of the heuristics suggest a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=how+to+clear+recycle+bin+on+android+phone PDF link annotation
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139068b3b86b---tojabonafubixis.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/204078dcc0248d4db1b6a94d8a60aa25/22266768509.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/bekefaz.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161404922857b8---movujogikujajerupib.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/pikadiseb.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/92405026501.pdfIn PDF document text
    • http://jucal.es/images/file/zimumawenivomafoje.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/33545452684.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/zediwonifuforu.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/menamowolewexejilejakada.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/54921603939.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/jiwaligi.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908192902.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/fuxodiwogifofululiletex.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/96976752754.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/11172523456.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/vedewe.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/sezajotasimaw.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/tovozubodi.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/82022806538.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/97947123868.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/78778925028.pdfIn PDF document text
    • http://licausi.it/userfiles/files/devaxoxosubisutojixaxom.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602ef64fc2---14350231009.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_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 10776 bytes
SHA-256: 8340e2033b65abe0d34b9b56ddce3231308969827b9428cde690e687ece20989
font_01_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 17532 bytes
SHA-256: 900a7aef404b6eaee1022aca071d7c1f1d30cfb8939b53510d6bd0e15fb202a2
font_02_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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