Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed59095a51493f11…

MALICIOUS

PDF

151.3 KB Created: 2021-07-27 04:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: e095d3a75c65ece6f45997b59573b409 SHA-1: 00d400a44285f2b563fed729da039c90b0ebdd5b SHA-256: ed59095a51493f1101687c3c301965218032f64e634c94fb82ab02d7f039abf9
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 0.9963

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160783fab65479---lokapozobujagelewip.pdf In PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/m800kn9vqhae2tgklrg3eive80/vuzurogusinazomalad.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/87157509949.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/gijikasezanamuxiz.pdfIn PDF document text
    • https://ksboutlet.com/file/files/77013162593.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062406531889.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607881bbd96f2---xomalurajilopigotu.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/barufifuterufolirisukukuv.pdfIn PDF document text
    • http://thongthien.vn/upload/files/fuxuwapebalogezilate.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bffb61cdb---zodedisifotoxinaxadixuvo.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5eea64a76---82717665100.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160992e22e3e12---27816116337.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a640924ce7a---45034569491.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777ed06a739---wiwupasoluxuj.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb689f97583---lolowotoxevikapifat.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/85b5eeacc587cccf9e099147573bbf24/44364207768.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/rodebetuxodufip.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b5d52f2ce0b30aa2fa557188e9dbed66/15054834612.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gaxogotodalekujofoxulideg.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b12aa93fb08---32069180446.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/77980131577.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d118d5afa6b8f1b6acba9756a33f74f6/fabupokapoparogezoluso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=7+manzil+of+quran+in+urduPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001c0b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C0B1 25392 bytes
SHA-256: d5a7132e9a245fc6d28c08d450380f08f3157a6db9c98da73edc78b15422d979
font_01_sfnt_off0001ec8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC8F 10376 bytes
SHA-256: 4df3e47230292746886f20f691151fbe7e2c0251862e750f2dad1c196535d0e2
font_02_sfnt_off000203b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203B2 18940 bytes
SHA-256: f4f29afe80ba87d5fa8050ed08bacace51cd9c3ef6661db5323b90796f67158d
font_03_sfnt_off000234ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x234AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1