Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5c66f64df76344…

MALICIOUS

PDF

74.7 KB Created: 2021-09-18 18:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5763fc693e9e30ae3b3996980c42ef0d SHA-1: ea190f9fc848855265189edb1be68da4606a11fd SHA-256: ff5c66f64df76344864f565fc3df18ed80404c99f88fe934619e94bc84a5225f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://drafthe.ru/uplcv?utm_term=great+ideas+great+life+free+pdf PDF link annotation
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/sulidufen.pdfIn PDF document text
    • https://stvorki.ru/files/file/lusidedozidozadozif.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/jovivamagebitufuzozi.pdfIn PDF document text
    • http://sghr.ca/upload/ckfinder/files/zewosegimob.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/31172226101.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161356c8c4971f---ruwinidorapafegatajewawas.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612f956279df0---bibofunaxotid.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/96856193722.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/debatibokamamexuri.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/95989802442.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109110102363119.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/lobevarunelufisewufiputo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/supazimamatorutofavegax.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/doviduretaf.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/9603218746.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/borinefotul.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/25233433554.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/jezolaseguz.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6b6b0dc4---moputesu.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/20546351783.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/26391618389.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/95782249150.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/64137905418.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_off0000c247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA59 16668 bytes
SHA-256: 9c6edb12166e739f5a4931dc1b03e650fdd94b0dae041777de5ecfe5661d0704
font_02_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 10488 bytes
SHA-256: bb155d9f148612eba8fe2493375a8a20898f1234496571eeaae23f1295e7eab6

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