Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f0a23e0990fa9d…

MALICIOUS

PDF

90.3 KB Created: 2021-07-27 16:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b2eea2437914bb65d94613236bd4aca SHA-1: 8b45b9bb37f931b6a7f3c70025b9fb6cbfbd15af SHA-256: 55f0a23e0990fa9d51f52c17a07ba4cc715a49aa3e9ff1ba88408fd5822baad9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malware or phishing content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/rghnf1vrgop3s3d5gortd5gft6/64805561593.pdf In PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/00a2c5a141199f259b6f54b2d0fa6a60/poxawewiduwat.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e21bc9d3d01a10555b04b9c9c66836fe/18919364574.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/65e9a96b55535418b3d322fd7805f399/bazimipemopafuzul.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c420633fcaf---27220819208.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/93690597141.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/89jsgbomhrq8a89hscqfht6mj4/8679766250.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/nubexorunum.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00ef6b5d5---24341089986.pdfIn PDF document text
    • https://luminex.pl/upload/file/83415840046.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/34775585336.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/59101668136.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a382ca4a12---vepulipenitapijulut.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/jpoer90h1plmksahgvpim970j1/33793546072.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160812571c4b99---badaluzobujafugezi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d77b23d942f0bd87d83b58a0877f29ab/16714289456.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/58677344244.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/96337494810.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6eeebd4edf686857cfde5d8f7bb321f0/97464187826.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/litulasufuzifezedoteg.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105180108245938.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16097acbf07bc9---gonodadupoweboxos.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47750198916.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb51cd094a---xoviwevafu.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/20259077867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=new+cg+navratri+dj+song+downloadPDF 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_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10804 bytes
SHA-256: f44e6ad039f95b61afeeea32648c15a1ba9e397dda221607f90fbcbf8c0bc74a
font_01_sfnt_off00011649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11649 16920 bytes
SHA-256: 54d833053a66f1d8e9ed50051e3b08054f1959d469e8a2eb447f08171c7ec162
font_02_sfnt_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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