Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7f7c2d1197c6bd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 01:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53698a626c4f408f7c1b59b44ae17ce4 SHA-1: df732b9e5442ffb75f4edd7b5e133c95f66b15c9 SHA-256: 8f7f7c2d1197c6bd10b73088e8be733f61f2770cf28221585548b27bd53c807e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL findings strongly suggest the document's purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160921dba49dc4---95923049551.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91233149034.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/jujenizejagabosijo.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/68389247171.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/493b82bb00aa82060ef6440bb4b0a7dc/26043397995.pdfIn PDF document text
    • http://broadmoor77.com/clients/39738/File/73223657029.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/64555999174.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/98015898474.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/zedifevuk.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/45566953482.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/7574289855.pdfIn PDF document text
    • https://ekransamara.ru/files/92086376084.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/pexonekaxiwimiz.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uin0ghmdd44vv7tvjpso50hfu6/54821853468.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/zamiwazise.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/39883615737.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/35308587629.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/1l6seuricjmgd47mislkag94nd/wafanujapujigusetirox.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/94595786419143283b7e4fea0c7dda84/latat.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kezunon.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5b2d3297f3ca5a11b54ff14280683c09/53134289716.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609249cbb6759---tukiwoziripiwozejoxade.pdfIn PDF document text
    • http://exima.kr/userData/board/file/bikubipezunikodeme.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca28cf0a68---16885625862.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/75980283393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+convert+pdf+to+jpg+on+apple+macPDF 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_off0000dbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBB 17860 bytes
SHA-256: b12d7510d2788285dd74bbd598e4097e831b6804ec4cb974c1e91e1fb98e52c1
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 10976 bytes
SHA-256: 07941c96337ea17b2adb3b7f6a721af40d404a71ef8e37b3381f02b8539dfe29
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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