Malicious PDF — malware analysis report

Static analysis result for SHA-256 6980ecde31731a9b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 16:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6840d8c3a6ffdf43ee6fe1e2e75ed7cc SHA-1: 4879e4f9a88d38d3d77b34f33c0ad23c7661d57d SHA-256: 6980ecde31731a9b9d442c61f87c311badf0a5e61b812064ebd6000d242ab14a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fef150cda8---sevatiteridekogab.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/81952859564.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/soxukutopuzemas.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/79897499323.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/349de0275ba2154180b7300a375abd97/defewixuzaxivudizidox.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/37969554102.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16108b5e7168f7---4378853066.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909cff8ad46---sepikuf.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/79c1b1a8e0badee390a5f9d345b26966/popawanuvakiwivibam.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/rirevuvavaxubodiwu.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/84281125491.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/82562979328.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/xetiwowudutebosavaxovo.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/vuloneferavamusu.pdfIn PDF document text
    • http://specimport.by/files/files/64397487176.pdfIn PDF document text
    • https://wittnebel.dk/file/86075351090.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/munes.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a9ec5fd07972e06e6e37f48904bcb362/roxobijis.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/19445389269.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/68682940255.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/veletanugemebitefixijuje.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/sijodid.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/0kuloftfhbbmtvn53mui672090/judirosoni.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/00f18ba12ec95ceed333a776195f10a5/matokudopigezuxu.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/rasomotiravuwizelogivuwuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=t2652+s+manualPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/49730118051.pdfIn PDF document text
    • 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_off0000b473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB473 10212 bytes
SHA-256: bb1bf647e51b6f2e729b08da4739f6e5239fef6bd004536af3f9daec3e2b83ba
font_01_sfnt_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 14624 bytes
SHA-256: 6c9138a47613c1628f3aa5b9a70bbac712bf70b96d916c2f5b982f641cf2773c
font_02_sfnt_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1