Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc213f93a92e74e…

MALICIOUS

PDF

86.5 KB Created: 2021-09-07 21:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc3f33281005d7970c4b69302f79e6a7 SHA-1: 418612ce1c132ba9127da409885881e7f6f4694f SHA-256: dbc213f93a92e74ed036574ccb70dd1c61427f0e88dd9df289aa82a6a6058773
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca30ade8450---35673423407.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/j3rir51a4k4bdv9rm790qs2lj2/vubakovomejigenalu.pdf
    • https://candica.pl/ckfinder/userfiles/files/vapilunuxotige.pdf
    • https://wildarium.com/ckfinder/userfiles/files/rufatiwolidula.pdf
    • https://akita-inu.lv/www/files/files/vepazakudizanuvoxaki.pdf
    • https://milliondollardesiclub.com/upload_files/featured/files/2425810562.pdf
    • https://xulynuocphangiathinh.vn/images/pic/file/68105755974.pdf
    • http://jjinline.org/file_upload/file/9123796036.pdf
    • http://harryreichert.de/uploaded_pics/News/file/78255554723.pdf
    • http://bike-aholic.com/UserFiles/file/87031457028.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/vudeniridu.pdf
    • https://gmnavarra.es/ckeditor/files/81693863798.pdf
    • http://dioceseofniranam.org/userfiles/file/savenilumenetiliponij.pdf
    • http://safarekhoob.ir/basefile/safarekhoobir/files/lusalefore.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4ea61e454266144d3c17780c12af8195/31144826370.pdf
    • http://csc020.com/userfiles/file/20210619182203_jw97rp.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233fb993408---sukeva.pdf
    • http://inarchengineering.it/userfiles/files/61043920606.pdf
    • https://tauthuy.vn/upload/files/87250058781.pdf
    • http://teknis.it/userfiles/files/80035682495.pdf
    • https://africanresearchcenter.com/userfiles/file/gibogovopofejerizematet.pdf
    • http://ettorebelfioreliutaio.it/userfiles/files/wetinaruxexasezanirusu.pdf
    • http://www.museopizarra.com/ckfinder/userfiles/files/78746908299.pdf
    • https://gerastar.com/userfiles/file/baxuj.pdf
    • http://olimpic.hu/ckfinder/userfiles/files/3615310733.pdf
    • http://naturallabs.fr/userfiles/file/toduwineg.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=hipocampo+memoria+pdf
    • 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_off0000ecde.bin
56d055645e18079330511656b1887c8419f33977539de439aec2c43749e1db52
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 10356 bytes
font_01_sfnt_off0001042e.bin
d636114a7041436ab4ea933cc9873f10cfa205fb893d40bf7c69e1290f76b5f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 19308 bytes
font_02_sfnt_off00013424.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 16792 bytes