Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d47463916ae12cd…

MALICIOUS

PDF

87.3 KB Created: 2021-09-02 19:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 079a485630c133989d51d87f6e15bacc SHA-1: fedeeaabc4671d36facdb529fe316c3cc5a1d728 SHA-256: 4d47463916ae12cd18d15a005924a3c7c8d4aaebda7ccd40538228a4d9ad52b8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and numerous URLs suggest a link farm designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e094291c75d---2890128098.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bcf12dc5c---xegokatunigofifisogiw.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-20-14-57-02-15XIRqAE.pdfIn PDF document text
    • https://izr.fr/files/jizawidapepom.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/cf013c0a09bc8332a11537a9897a8f06/33577121752.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ab44a221e540df41815fe6a3441e668c/desabefowoxuwefugukazutak.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/0k7u735srfc2u686ku1u11btv1/saxusonizojigokuwe.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04aad6293cba4e613a27101d1a248891/fuvavabogedekub.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qpdjvru7m1h31121s9fg24irt9/mopewotosig.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210731/file/16277461805651.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/85819800172.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/55515270914.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/24176972801.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/lafumasedu.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/93019632102.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/pagatikumowoperekepij.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ea4329c38161928bca56ea6d7ed4e916/88083393828.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/69987280869.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/fisikolev.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/dadalagegoxa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e73cc506c---48298545669.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210703_83A26B8CBF13BE6A.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=literary+techniques+quiz+pdfPDF 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_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 18604 bytes
SHA-256: 884587494fe26dd0c418de6d0927afa5d14e7758def52735462e7d0c13fa7e8e
font_01_sfnt_off00011e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 10928 bytes
SHA-256: e143111aab53c9ae66e9a623a633354dffb4d96142654e10dca624d418827127
font_02_sfnt_off00013780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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