Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec93f6f43683612a…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82a910079b4eabb01d2e594a33eba233 SHA-1: 5f60c1443c071c2cb452a08cd1282e88e678fd2a SHA-256: ec93f6f43683612ac59a29b5db626c49078c08977b7b48c7e7f335f4f43d785a
184 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, including an image-only interface designed to trick users into clicking a link. Heuristics indicate the presence of embedded JavaScript and external URI redirects, suggesting an attempt to download or execute a malicious payload. The ClamAV detection and ML classifier further support its malicious nature, pointing towards a phishing or trojan distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kondicionery-krasnogorsk.ru/upload_picture/file/5609189434.pdf In PDF document text
    • http://garageanything.com/js/upload/files/zodetefasidinemudafefotu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/62890405050.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/lafowufiguxenedezopa.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210923_045143.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149b8cc6722e---xitazoneruxogolas.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/firekitowutes.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902060809.pdfIn PDF document text
    • https://actorconseil.com/files/file/vafanuzemazonipofenawus.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/54784661272.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/93365446513.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/67166548521.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/gukoripam.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/29810009490.pdfIn PDF document text
    • https://hobbypet.cz/files/file/47877114339.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/jeduxopasanigukeran.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d60675ae44---zufopigelibibatuzofifo.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/12272894156.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4a37bac5b4f0432520759163bd10b469/11136967775.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/5540991073.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/7705304441.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/78717392265.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/xazevusadosub.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/99524423040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+san+andreas+machine+gun+cheat+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://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_off0000b014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82B 10908 bytes
SHA-256: 1413131afa080b1166853fca49a1d8c6bc82b626577d64eb44fd51f0c3c79946
font_02_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 14108 bytes
SHA-256: d61404d3f04884b0221415223e0a6584915d86c92923f8485f8af989bf6358ed