Malicious PDF — malware analysis report

Static analysis result for SHA-256 8126d3a8b6491da2…

MALICIOUS

PDF

94.5 KB Created: 2021-07-06 14:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2cc76ea79e97d526eccaf6133710f3fb SHA-1: 6cc98846f433ee0d0b750b369fb6c48c44f93bfb SHA-256: 8126d3a8b6491da2c644a0b7774ddd5b893c2049f603ea008aa94c9b1b6343e4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload directories and other potentially malicious sites. The primary purpose appears to be directing users to external, untrusted resources, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/469e6b75175ca5f75a09f1f91051182b/63181817790.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77115149f---65383254682.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4191894136095cdfcec2db.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/5408176016.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753e58d9ff8---11566243603.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/61a63be024ca160f9e685071b293e56b/30897235226.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/43838290089.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096e53b240b3---56290354207.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160adb656057c7---gesuwutubododinenefufali.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/bamexanedabowexe.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/77880791031.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/97969926441.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609282232a84d---34957459837.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1608126d7f4111---81291501335.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/werozokotumuniw.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/suxigawinafanu.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/22355414411.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d7901dd1---nutezemi.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/pamolewunigi.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/19ad7ececbefa529773446839a7dbad7/16928197309.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c45b99166b---63178379214.pdfIn PDF document text
    • http://wenxuezj.com/images/File/turawozabamokivurowo.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/mpgb7afkkghq3p1ougbkqt05vt/nupekaseninowimakudami.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608580949a245---garuzepewadiseniloli.pdfIn PDF document text
    • http://ned.ru/uploads/files/97920929254.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=seeing+double+with+glassesPDF 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_off00010f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 10828 bytes
SHA-256: 5fc084b8be7808c89c5d3207bed866853d14a823bf59e81677ba669dfcb01811
font_01_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 16928 bytes
SHA-256: f5c6bb327fd594b32b4643849fbb98053a6a449e5257d3ca6c7d56e7f3c02f8b
font_02_sfnt_off00015497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15497 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1