Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db536e3238c9b17…

MALICIOUS

PDF

84.0 KB Created: 2021-08-03 20:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b850dcfb33a7d7b5045446b9e2e9ba51 SHA-1: f4548466887ef632daaa586fcebbc16a76c47118 SHA-256: 9db536e3238c9b178727a46a6b3c303fd498aa20e00d8bf5bf1b66f3f67f3293
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports this, indicating a lure to download a malicious payload. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=kvs+ldc+previous+year+paper+pdf+download PDF link annotation
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/13194338747.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/rilana.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/fidesovixawagij.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce31107e008---68110716894.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/fototitixemegej.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a25dbdad5a8---22764894698.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/radotuzeliwaruvezi.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da90fd0a5a---15998424501.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9e42a37f9b8a1cf042267e4308e2422d/tuvunejowepomulujesed.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/59416975679.pdfIn PDF document text
    • https://abeess.com/userfiles/file/54338435394.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/u9fhaer8k52ovs781v6g2qms8d/tejinenifeduwudakawe.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/foxubo.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/87841557323.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/91779208531.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/2ddbd69b66ec37c058809fc5a361f51c.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/bec942d653560fb42272d3b1ebc5e874/23658082255.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/78012327061.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/42295041749.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/ranuwewebowinuxogigo.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/bb03ace6d9b9509f8c8364506ec66e20/30307839253.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d9127a79c43ea3de5ecd77930f96f8c3/84619480826.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_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 17052 bytes
SHA-256: fcb20bbd663c63e4a890005410346c14399b69affe30df0de573b13ce5373fae
font_01_sfnt_off000110e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10872 bytes
SHA-256: d2ad2269f98b9b06908429025620253963813be6e934ef4df0c42bb446debcaf

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