Malicious PDF — malware analysis report

Static analysis result for SHA-256 f144fe926504bf24…

MALICIOUS

PDF

85.5 KB Created: 2021-07-14 00:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 1463efc0f7c5f9654b8487d8c825ee45 SHA-1: e144a64fe3bd1c1edb02c4786f52fbc25f53dc7a SHA-256: f144fe926504bf2476fcfd8d3145aa6d673be32e2e70cc690a9351abb0293371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://bundoreh.com/fckeditor/files/file/76406394216.pdf In PDF document text
    • http://sintellect.ru/Repository/file/xebedutamife.pdfIn PDF document text
    • https://energooptima.hu/upload/File/fawikuledesegutobowugezav.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd685653b8---xifewiwufomegeporelulepo.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be70a291021---87575416137.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081f20338990---dipupofekapesezesekivu.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/24094724499.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/136a4172bf229bf04321fa101e0f0bdb/20111977887.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/a3ed4f2b15f069fcd6a6e603c3cf7af6/66465216248.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/55968559749.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/rujezabozokelusu.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/6168960420.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b30dfee2d13e35c71f92f9f77389188e/49784038399.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/norejamidaxuvikimawu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e400c35e60---19033329701.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/95380624582.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/14601726557.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608045562abda---80563057919.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6369f5286f---derunidopuxov.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/6527237161.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/81922020194.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/kalifazumuxividox.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/zitumesegasatujaripa.pdfIn PDF document text
    • http://mfahk.com/upload/files/73064415716.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/43189906872.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=there%27s+a+hole+in+my+bucket+dearPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a851854e6---lujonuxi.pdfIn PDF document text
    • 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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 18712 bytes
SHA-256: e01dba1f7f014b4bee7761c65e567362b9330d81f663bbc18cb9c574e9a08808
font_01_sfnt_off000116d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D8 11076 bytes
SHA-256: dddb35eafaceb297fdbfb5c1672b529cac88c041b4c35e300c9da9196d1393df
font_02_sfnt_off00013090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1