Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a065256f5077e5c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 10:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f63dfd98622dd977b777adeb4569ca2 SHA-1: 13707a3dd8297f91bde850a185c589f93d8fe67c SHA-256: 0a065256f5077e5c312d3d9d2ad5e95a0bc49afaf48b56852c23dc9da5ff57eb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristic firings suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/60613778162.pdf In PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370a68622ac---96475698481.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/nanulajifawoluzubagidaxi.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nigefotixerofefuwilobag.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/nebafilatixivetipolovuz.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090515351673499.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/87082037403.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/wisinozoxaror.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/7576026968.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/kedoruxutikapibidaxev.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/92568946598.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/vibunateke.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/sebapa.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/30343941009.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b084c1768---41436604616.pdfIn PDF document text
    • https://taperagi.com/contents/files/72538085732.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/8942524334.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/84766717536.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/parenizok.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/6svekr4n0jkre8snogft3mj032/fatekagexofenob.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613727ed811a7---gexotavuti.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/wakimubu.pdfIn PDF document text
    • http://king-tableware.com/uploads/files/202109011722519285.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/vewuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lwp+lan+multiplayerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F4 18148 bytes
SHA-256: 80731f62bcd6166285c5f43f970b7fc224d19be5ac4382f912a230e98f098e59
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 10380 bytes
SHA-256: 7469100a72c453b85804b96b62a8c85c5bbe532fd4cf2b6456804cf16aa9e42f
font_02_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off000126c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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