Malicious PDF — malware analysis report

Static analysis result for SHA-256 81495daca49da198…

MALICIOUS

PDF

86.5 KB Created: 2021-09-09 05:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4834a173956e738b1d6718ffc2f8d2f SHA-1: 65b48ad487252b7864d6dbd4422edd7dc5e74550 SHA-256: 81495daca49da198b98be1c95c36f2cb99a67d242b4923bf398e0d1da5c780f4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm on potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

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 http://yurisolomko.com/userfiles/file/rawix.pdf In PDF document text
    • http://delfosventures.com/userfiles/files/25067476867.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/fapewaze.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/supixedevad.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/84550301891.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/dumuzis.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8a7b03788---50681946437.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210901133053753.pdfIn PDF document text
    • http://lblussana.it/images/file/28322086395.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rajivedagime.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/77702034425.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/94237886469.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/d57a8d20c2ec25df991d3dd52bc4226f/dubeminopananatifos.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/latapo.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/luwipadorolawanilelavosob.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613577c9d8c06---48245051505.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/powepad.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/77714481971.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/5020186155.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/34077350545.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/pokizudoxovozaranom.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jovabozovipemijejer.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/davugogewizilitabuxizuz.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/36780887528.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=phone+with+flappy+bird+pricePDF 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_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 10888 bytes
SHA-256: 3407866e4f6534a915c4885714b7849ccc9e4d802263653999b8533dd4419a43
font_01_sfnt_off000104d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D9 18296 bytes
SHA-256: ec1aa4d65b5c24b8e1fabc74bb784894509b375c830a64204070370744e1e412
font_02_sfnt_off0001345d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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