Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ab8fab4855da19…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 19:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2970c50f463f053b2f34da0445893199 SHA-1: eef23272cf4edfc78fee41bee35ae21b8e4ee066 SHA-256: c1ab8fab4855da19db1b9405271d3ac176c4de59dd01ef36cc1ecf6768ae9177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, often involving embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=drawing+geometric+shapes+online PDF link annotation
    • http://arabic.cz/ckfinder/userfiles/files/nefoketidovajumed.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/sekoribagaragovininemiwej.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/226fd3.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/palemonojozo.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/muboporavutegavewib.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/meruwejuwelunuzizive.pdfIn PDF document text
    • http://hongdacable.com/d/files/32241203506.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ae5b90747---24043336802.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dendag2hq77dbbsdvqt373nup3/69153095029.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/tuvelakubotimalirakexej.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/85206873783.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/40849390349.pdfIn PDF document text
    • http://zimmerei-possert.at/dobezubopan.pdfIn PDF document text
    • http://vipdiler.ru/files/file/88013715020.pdfIn PDF document text
    • https://argumentua.com/i/file/lidemewupakibogopox.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/limikapifezafe.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4bf2h4u2svhknt3u9no5rlmf88/kegulerabutafukokokujag.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/sopeze.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/43177605068.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/vubufujorapotovetazipawad.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/mofedutasegusiga.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/25619400809.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/vupidakezabiwemefuvi.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/xalagapinime.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/ziladivatusiz.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/1241159749.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/duposorumew.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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 17372 bytes
SHA-256: 4e156790f3f39b8a151a7bbfdef5bc7a24c82aff8bb141a3d6db0cec5ad734ab
font_02_sfnt_off00011de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE5 10908 bytes
SHA-256: e799ce82f87f544f2785f7de2f4c4cc344428232ae425295ca7bee50a881682f

Open this report in the interactive analyzer, or submit your own file for analysis.