Malicious PDF — malware analysis report

Static analysis result for SHA-256 4332ef18173fc701…

MALICIOUS

PDF

92.2 KB Created: 2021-09-09 00:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8d95c4099aa15ec7776c25fd5b6327b SHA-1: c12979a0df4da79e4350130937417df70e54f567 SHA-256: 4332ef18173fc70172d1f094472230a7adddbe674d1662d1b9723686f7aca664
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it contains a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://heyratacademy.ir/file/rolozidi.pdf In PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/34835160774.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/3357450172.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/zagevuminizepuvatesofa.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/10513853134.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613163abd7318---99453484023.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/10525025139.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/rimofo.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/e55b8ff392f19c0bd402130383d3a52b/nisuni.pdfIn PDF document text
    • http://soles2walk.com/data/file/23514827603.pdfIn PDF document text
    • http://tootingtaxi.com/survey/userfiles/files/53603526917.pdfIn PDF document text
    • https://33mobility.net/uploads/files/21874374488.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/20440124545.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/niruvudivugem.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/bazapane.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/feninavudizuruko.pdfIn PDF document text
    • http://starma.pl/files/file/kunodiwaxo.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090323015070554.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/38517202560.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/70631169366.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/mukaveruzokogivatidodawot.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/ed11eb00336ccf586ef41dee87a828dc/kuzejodegu.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/95494515306.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/ruvabanixer.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4ba257adde15c96f5bca369c1b986fd2/82017042449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=beyblade+burst+rise+qr+codePDF 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
font_00_sfnt_off0000ecd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E6 16424 bytes
SHA-256: ef8701eb79685041ba51b48b3ed5be6a2743d899f5b89193a8f0275675b44e26
font_02_sfnt_off00011ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA0 17960 bytes
SHA-256: f0176d31e40420cec0d3d7a50c63d0f5d554b41b24a9309fb5f971cc04c15611
font_03_sfnt_off00014a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A35 10812 bytes
SHA-256: db8a74250bf080be1491c4d5ec0a305e97c68c24a56d87d7b5b22de7c919757e

Open this report in the interactive analyzer, or submit your own file for analysis.