Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dfbdef39e058ba7…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 13:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd8a47f25b458cd6068499bb1b7f5054 SHA-1: 7dda24180dfae01a0816551027ef76059d8b1963 SHA-256: 0dfbdef39e058ba70e338a8a002d155ef62da50ff8f812b78fe5d1d0862d4c27
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting it is not intended for human consumption but rather as a vehicle for these 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://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bgkuumjnscpdi40p5tn54qg6p8/vafozemerokup.pdf In PDF document text
    • https://nieruchomosciturystyczne.eu/files/file/zomazezovuzorevu.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/gerujar.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/28379975645.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/611c7c9bd58ef4e68981d347acf14526/89284260482.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/42404791720.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/8820455843.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/rixigiluvul.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/91928891412.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/13608933554.pdfIn PDF document text
    • http://szhlfz.net/upload/7197035631.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb23e31f19---91010295254.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133207114bcd---16582841249.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/48211440867.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137819e03e89---39458919905.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/lozilukuvefusazijil.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/8697898731.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/janipejutatokebipi.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/resexitupewi.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/mezolirugakezetowakejota.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c39415af73---34335678954.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/61cb7d71d28a98169096900453d54574/wabirifuninirezixaxe.pdfIn PDF document text
    • http://ned.ru/uploads/files/gosisev.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/lujapuzomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+change+specific+app+notification+soundsPDF link annotation
    • 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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 17732 bytes
SHA-256: 38504a2067a639bc8da1a4e663bc6bdb55de2a503d566d3ab94a15805b197b40
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10932 bytes
SHA-256: bdc7ec01f1cb67596dbc6b01de7400e49b8b00502fd18275fa6661dcd3a4d653
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1