Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89ef6f5e9b1918c…

MALICIOUS

PDF

130.3 KB Created: 2021-07-25 11:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 81a8451a56c07e70a3247265a631bdd6 SHA-1: e85d40b33d1759e46a7a5088004c1b83af5e59dc SHA-256: e89ef6f5e9b1918ccb660469c0e780a0ec50ee833a0cfdaa071e1aa0a0485f03
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 0.9665

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://thegioituigiay.net/uploads/files/49403205737.pdf In PDF document text
    • https://griby.biz/ckfinder/userfiles/files/veludexebezatajinizisu.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/dokuwiriredi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/99dd6d094d1a835cc333d446d2cb7a06/37437277446.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/83590316437.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d8b3e3a45---56384697025.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/xavovukumajabulolip.pdfIn PDF document text
    • https://ekransamara.ru/files/13517788390.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/509737fdab79e066c83adb22ff65fe31/26375138233.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fb7cdb73b5991ae7b5fd46f3ee3bb942/kapoparagukovu.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/98824555773.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/97537064325.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607338e40249b---7820197103.pdfIn PDF document text
    • http://naviway.su/upload/files/zekodorose.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/59302958159.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852ce5db9b9---50364730264.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/lefatebevinebaxutejoba.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/s3j98db4i8jtrco9kg7qgnc436/15008938359.pdfIn PDF document text
    • https://ivanamihic.com//files/korijasuzup.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/a98d4b56b30f6a1c01aebc4e00a487d3/wiririjinoxebojapipu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/5d1582d48818bc366e354833ae9c5eaa/67978075473.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/21512450632.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/662f57kahdf1u4b9d3gk5r8l8p/30938617903.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/xejozoxe.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/gvdai18qmj5cltfnk9j7c31u8q/gigogofenexet.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fuzut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=%D8%AA%D8%AD%D9%85%D9%8A%D9%84+%D8%A7%D9%84%D9%83%D8%AA%D8%A7%D8%A8+%D8%B4%D9%85%D8%B3+%D8%A7%D9%84%D9%85%D8%B9%D8%A7%D8%B1%D9%81+%D8%A7%D9%84%D9%83%D8%A8%D8%B1%D9%89+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000164a2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x164A2 33780 bytes
SHA-256: 5b5cf445173b15327cb781afdc48098625311f1bfd2052fc1299e5d88df96a5e
font_01_sfnt_off00019fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FBF 19072 bytes
SHA-256: 12a56f3b85dac0cfb5a5dc1b07f6b1a4b0a287f62dc7bc195bf40f48a3f696b4
font_02_sfnt_off0001bf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF5A 9372 bytes
SHA-256: ab692011bb810b4091e5b6863c1468cc19624005727076e0e42723678ec61724
font_03_sfnt_off0001d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D339 14744 bytes
SHA-256: 9701dbafe3214bb101c0541551300dfaf625df68d2747dc2e645eb3f3633c025