Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0d8fb4bca3105c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 04:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 125ee3ef24797dff0f89c53ff8b809a6 SHA-1: 0fdccaa23699e822e90a00cf6e78740e0de8221e SHA-256: 7f0d8fb4bca3105c9c2933c85786f4a6a53eb906fc4b30d2a91693c698e6cb55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user interaction lures.

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://yh-nutri.com/filespath/files/20210901122544.pdf In PDF document text
    • http://ejmk.com/ej/upload/files/71981795862.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/74897871805.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/sejunibifilem.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/dolepuvuxag.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/vomupijenijakuvegeguduna.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/61531349793.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/22083413734.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/54136889742.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/83719063028.pdfIn PDF document text
    • http://bankerz.in/qpic/files/2991987426.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/natozozadizilozeroganuk.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/98607554912.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/sifipewemezanuduzoleb.pdfIn PDF document text
    • https://magerp.org/upload/files/gepavanivavumaxanuxugada.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/zuxezavetokefe.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/38329014329.pdfIn PDF document text
    • https://bfull.ru/uploads/files/sizipatarokoz.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/589226789.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/woletegoxogotakunuwefofof.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/erkvj04k7lv6jth0148eedqaif/redoma.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348580bc23d---zomivosazi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a12bd85ce1---siravadawelitufonapomako.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/88039481400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=1500+square+feet+duplex+house+plans+3dPDF 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_off0000b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C4 17456 bytes
SHA-256: bde3d1df718085897fbbc1977ecca3150cee6e79daf43517fc6ff4aa1d90674d
font_01_sfnt_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 11232 bytes
SHA-256: f60f060e8a08b732d071b564e1814e21c200824a67c1ffbfc29887fb29970902
font_02_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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