Malicious PDF — malware analysis report

Static analysis result for SHA-256 2779f419d9057972…

MALICIOUS

PDF

87.7 KB Created: 2021-08-14 13:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b05f35a45a2963f0d6f3475d8bcbaab SHA-1: 7ec0ef9c06b48aabf1e68d021a679890e815346e SHA-256: 2779f419d90579725e1d0e99f849d6155313c715c9485c11750580d6a467a389
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/453bd5d7e742a9c186541301c1592218/83942744543.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608904a349c92---gikopefufe.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/87235469405.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/291758265305.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783f9376a24---42684349010.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae65200db0---88583271199.pdfIn PDF document text
    • http://sushi-belovo.ru/files/81430334951.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083428e6cb6f---30524694863.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16077ea5646ab6---22124354042.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/fozikolejewedelipi.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/2sf99agqlk7jthk8ms066kfqlb/18492328831.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/16911624198.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15b5b5a03---bipomivagibexev.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/bebexovefajifo.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/furemaburodewez.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/62740584507.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/77453391812.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/149d63cbc194ca896cd66964a5bb6f76/48633523419.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b03c707604a868b087cd19c33c542bb0/rexeba.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/30594048790.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/95a6f37b9d5d8efbcd5f0b4c63f60484/77190456527.pdfIn PDF document text
    • http://ausafe.net/images/art/files/48994201493.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gamemetikuguzigul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=analisis+sintactico+de+oraciones+subordinadas+sustantivas+y+adjetivasPDF 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_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 18540 bytes
SHA-256: a9b8e6c7e8c61147ad572359d829c6b017e6636e039ecb64c28cfbb0aaac8b62
font_01_sfnt_off00011e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8C 10892 bytes
SHA-256: d57fe9261e2a489e9a7d4097b2562762d711f878e259e4bb1239bd50f4028b90
font_02_sfnt_off000137ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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