Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ca5b4ed60e3b7f…

MALICIOUS

PDF

83.0 KB Created: 2021-10-28 14:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8882d6dc77b9d71bb313f685c86fddbe SHA-1: ffb10e51bd49d7fd874135d1172fcc73b8441c84 SHA-256: 49ca5b4ed60e3b7ff773f066d1aa886bd0641004cee9080c3341775973975885
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to scam content. No scripts were extracted, but the PDF structure itself is used to host and distribute these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=big+meadow+family+campground PDF link annotation
    • http://improntediteatro.it/userfiles/files/26063649975.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/17799597705.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/1157917528.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/79197518103.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/fojekizuzuxojaw.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/13580736938.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/fubunuriruzozapoguset.pdfIn PDF document text
    • http://vhz.cz/user-files/xuzokujo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/14a4e90ca2368e4cdf1a746da10823e6/19353446396.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/76853228437.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/58114897163.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/wivivesokuruwo.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vazaribefafifikuponolage.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/jusuzonejaganamodudamufoz.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/13856896061.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/4717637254.pdfIn PDF document text
    • https://apelhijau.com/contents/files/61416437673.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/59363420244.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/84686636302.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f249b81f---dipefifawitenadiri.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b33bd9a192---22684589596.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/76197969037.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/toruborifuzikebofevumova.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/98925299585.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_off0000e00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 17328 bytes
SHA-256: 3f67bf4a1c262227c26905c5d9005147162cb9246b54e6f73adb04527c856847
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 11048 bytes
SHA-256: 185803e989e540e23e87910e5048926c1c6a24c73fd8248a31f8dcc17ae7fca3