Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f136f59a0da005…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 09:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27580d25c094c268e419ab1af3885199 SHA-1: 87c8924b4e93590388ec2c8a883500b8854a808a SHA-256: d2f136f59a0da005e6a917ed77a375590d790c97c0d3e3cd05ee069d38c79d3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous URLs, many pointing to compromised or disposable hosting, indicates a link farm designed to obscure the ultimate destination or host malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hotelgiottotorino.com/userfiles/files/65924813999.pdf In PDF document text
    • http://badgerhillfarm.uk/31769860662.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/kekobomukup.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-08/images/files/49128112356.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/29714490222.pdfIn PDF document text
    • https://tranhdaquyhn.com/uploads/news_file/99063135554.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/retejosir.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613878cd1345c---fajejaka.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2c77c6dcc7bc6ad08c6f369ba576a36f/60104412527.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/birusovipiremasakofi.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/qrhghkbh6ri7ighp2bogvph2h9/1763860989.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109051734267439.pdfIn PDF document text
    • http://leguido.net/files/nobanawasadebuxolarufe.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/ratenisosotelodipevifewig.pdfIn PDF document text
    • https://gestcargo.com/uploadfiles/file/28666714723.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/81819194743.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/406253384.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/51031077556.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/99548452620.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/bumoxadesal.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/44899034750.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f3709ba533b20a6d29f02ff412b455bb/36955377727.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161356de0dbea0---81039151194.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/gatigopekovawaj.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210905_31A3C135487298B3.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=injustice+gods+among+us+mod+apk+all+characters+unlockedPDF 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_off0000c271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC271 21344 bytes
SHA-256: fb42c41956d9c0358b901e0ee69983ef59c0be1b902d17ba8e60e00ff0d5a49e
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 11232 bytes
SHA-256: fa136c633f157f8833fa2a177ccf9083dc21e6ae7d6e41b5a42d51fbe94bea3e

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