Malicious PDF — malware analysis report

Static analysis result for SHA-256 1817fe7007dfbfcd…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 01:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2be6f487d0b56d961f531d5184a8ce4e SHA-1: c0bc149135f9531d075e97621e5a33e538805b0e SHA-256: 1817fe7007dfbfcdc9705937dcfb6b34b4da43e56437abd5e52904a409fc3c5d
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be link farms on disposable hosting or compromised CMS uploads. The heuristic 'SE_DOWNLOAD_BUTTON' suggests a lure to encourage user interaction, likely to download a secondary payload or navigate to a phishing site. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution campaign.

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://inwebjor.ru/uplcv?utm_term=wbchse+english+question+paper+2015+pdf PDF link annotation
    • http://pc75.net/upfiles/file/1621385959.pdfIn PDF document text
    • https://citronel.com/userfiles/files/90427818434.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/97606763292.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/79330484614.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/muget.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5shaoogi17g2s9it5dt9birlc4/86521121532.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/papab.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/dasinetenumuxoja.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/48b284211a87a436d4a8423008844058/98714375311.pdfIn PDF document text
    • http://sdes.in/uploads/razidilexigofi.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/bexerodekopojetadiruxi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dcb4c9cc---5022722255.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qlej6uu2451058vsa7590qb165/kapevogigijapa.pdfIn PDF document text
    • http://wheatland1971.com/clients/25033/File/kerutefuwejaromejedumov.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/kizuruw.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/49903345674.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/36867220299.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/91695858498.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/78526032685.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160728e3589644---dibolilo.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/tibuxax.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/roludularemolu.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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AA 11704 bytes
SHA-256: e9e505d1feb2534ffd2fc03ae8d7054f4416f8f6630c420e6639997ec2bfb87e
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 17708 bytes
SHA-256: 9a3a7343ccc60f946149498e37576b12623048550da964d88dd2b24b9552c3c1

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