Malicious PDF — malware analysis report

Static analysis result for SHA-256 0203da89f9b69685…

MALICIOUS

PDF

85.7 KB Created: 2021-09-08 19:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 238bcd2bcd2ff22c8e4cae3ffd1d70cb SHA-1: 77a16cfa9613f54346f872f070a6b5fd445e99b9 SHA-256: 0203da89f9b6968502e89d04acb9656f324c22e4b39cd3982d1f555333548e91
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document's structure as a link farm suggests it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gazeta-msp.pl/user_files/File/88131019747.pdf
    • http://honeystraw.com/uploadfiles/file/14974692643.pdf
    • http://shiny-baby.com/fileimage/file/29032353684.pdf
    • http://a-xian-coat.com/uploads/files/202109010037176509.pdf
    • http://ohana1bbq.com/uploads/files/87571215143.pdf
    • https://myshalewell.com/userfiles/file/xarimefenutudifu.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e7c3bf49---rebegusipaxipevezelokoxul.pdf
    • http://carlaschroyen.com/content_docs/86044595129.pdf
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/zukamebur.pdf
    • http://studiocinti.eu/userfiles/files/35052821157.pdf
    • http://ciskmv.com/css/file/nadaludoru.pdf
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/neloborifovowusewofifi.pdf
    • https://kcharp.com/ckfinder/userfiles/files/67165829843.pdf
    • http://geodavidepini.it/userfiles/files/mukuje.pdf
    • http://ajtoablakcentrum.com/_user/file/81703082797.pdf
    • https://ppntassone.it/dati/upload/file/fazasibude.pdf
    • http://baigeleather.com/userfiles/file/lozifudatix.pdf
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/91652043892.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e8a74362.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/0aaffbfaa64bf6f66afcc0c3b3d03a38/kokipibozefi.pdf
    • http://hrzservices.com/uploadfiles/file/56466246296.pdf
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/puvozakolegofumirel.pdf
    • http://gdgom.com/upload/file/2109070524495930139i8njguhp40s.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=miele+no+frost+fridge+freezer+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e863.bin
87c29a0e3e58b6321f4973c9fdd3acbb8f3bc1fbb364d9a7321f4bf829b2b935
pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 18452 bytes
font_01_sfnt_off0001182b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 16792 bytes
font_02_sfnt_off00013042.bin
9513c4ee12158dc839a48ecebff15cb3e04435d69b51c216bf57ff92b562fd43
pdf-font-stream PDF embedded font (sfnt) at offset 0x13042 10852 bytes