Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea23fafebeaeec0…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 18:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f27c463bc945f5d81590603e17392d7 SHA-1: 49c1aba70fb641b03e41fc164468523692e91944 SHA-256: 6ea23fafebeaeec0b131f5c68c57780ab4ff3ba478ed527add0ae1e19e550760
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://flagrant-desir.com/userfiles/file/sewamotewepujizajo.pdf In PDF document text
    • http://kcemsp.org/upload/editor/file/rapemaju.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/safuj.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2ccc2062f3bfe885b48484e87a2ec91b/gulow.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/78400217667.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00eeea50d---palogopuzef.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/loa7136fqodhefffok3v4kcg8d/51755830931.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/vcponadbbe7n6tfn1jbkpit41b/57162165657.pdfIn PDF document text
    • http://askaudit.ru/price/berumo.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/sejisip.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080b05383fff---11920938307.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/sulosefagipom.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/eiovbbjhvr867ch5082ipqboeo/bojizum.pdfIn PDF document text
    • http://platcometals.com/images/file/37820358361.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/93925620600.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/sixupata.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40b84e9de9---zobidaj.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/68064116491.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/95231345137.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/gowez.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/xemosujudu.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/fifugolanakuziguzira.pdfIn PDF document text
    • http://ibb-online.ru/f/file/1527127894.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/079562fb5f9bf2ee32a1868e2a00f532/dumesanogu.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/gozuzenos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=mucomyst+package+insert+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_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 11216 bytes
SHA-256: 8868f0bef717665669c522920414492642d8cd5cbf8247536737fc8e9d5ef26b
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 17056 bytes
SHA-256: 8a910547fb0e1371bc8d61590b5f5652aaedfa19fe06dcfd2f11eb2f59024a68
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1