Malicious PDF — malware analysis report

Static analysis result for SHA-256 834c1d42257c7bb8…

MALICIOUS

PDF

143.4 KB Created: 2021-10-19 08:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 26319ebc7511961afa6a658355d3590c SHA-1: 2fc422ab402466770eda7425af3aa6d2c81249bf SHA-256: 834c1d42257c7bb8aeaaad61ac9d69c05f68313d5308ca90a6c43328b96e1109
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning model indicated a high probability of maliciousness. The 'SE_CLICKFIX' heuristic indicates the document attempts social engineering by instructing the user to execute a command, likely to download and run a second-stage payload. The presence of numerous external URLs, some pointing to compromised CMS upload storage, suggests a distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zejuxezotalubute.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/60164e7a5a1c83d167f164369ed2b746/popotipogoluzoxupefexugix.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021100800260973499.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/jifukagonapisajoxulukape.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/86043369216.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614599d5ae12b---madoxevepibufowuposina.pdfIn PDF document text
    • https://www.poeles-granules-vasconha.fr/ckfinder/userfiles/files/96879628300.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/82374096273.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/zisobuxuxexe.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kumesovop.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/4663097076.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/86487326874.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kasewo.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/sanapozitobi.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/kadizirilemonolori.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/kerowidavemejeritu.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/dugomovete.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/78271253668.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16158589ca9bbd---dofabe.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/87267396928.pdfIn PDF document text
    • http://tuivaivietnam.com/uploads/files/sinitojaramomizudonidokad.pdfIn PDF document text
    • http://xn----7sbabjlebzbdsbxti2bw3r.xn--p1ai/files/files/kivejufuxolenijelasag.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7ba6d6a9be322ba302367ca51bff48f5/64404102552.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/1hHberoKktI/uplcv?utm_term=descargar+forza+horizon+2+para+pc+espa%C3%B1ol+utorrentPDF 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_off0001c2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2D7 21612 bytes
SHA-256: 57b29da2953f7d72d510f8edead37df46fbdf4af171eb11204ba7ffa5be91a8b
font_01_sfnt_off0001fa80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21297 11244 bytes
SHA-256: a5c292a7dd5681cc763631cf95cd642485a50d488070bea17d2552dfb1390522