Malicious PDF — malware analysis report

Static analysis result for SHA-256 d517d06989231beb…

MALICIOUS

PDF

91.6 KB Created: 2021-09-04 05:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9266f7b93dd2721d509b9779eabae09d SHA-1: 619131ebdd3e1d156f56bfbfc90b57adc6128bd4 SHA-256: d517d06989231beb430cecdd53694ad509324c055f923bfaba8289c23d82bbf3
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adlinefor.com/home/webagen/public_html/korn/data/file/34084269648.pdf In PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42642d856---tibubavulijekibomiviridon.pdfIn PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/81867628989.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9ee24270---viteluv.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/21mah0ha3qb7hq7pedp5ka28q3/79992579522.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/iqjr4vuml2d8fln3pl17ertia6/75633789195.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/nasisipifoxagumesiwe.pdfIn PDF document text
    • https://discoverthesky.it/file/27371621348.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/metuzedawu.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161185cd6d0917---7920380187.pdfIn PDF document text
    • https://rumputhijau.com/contents//files/diped.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/93328648602.pdfIn PDF document text
    • https://tigaintan.com/contents//files/lezawejogajimupirinek.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/84504229939.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fcfe63772c472d223f79de64084482b3/81156402668.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/86977338102.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/fugipogataz.pdfIn PDF document text
    • https://airshow-bg.com/file/juvezuzosusemupizem.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/24201893314.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/gimedozanadipajirumode.pdfIn PDF document text
    • http://bjallstar.com/upload/file/2891438676.pdfIn PDF document text
    • http://alkanboya.com/files/file///vawexamopemolenoro.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9c24c06f4---siwojusalusiwidalupif.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/1m36hs1m4gg3teijq8v0avip3j/guvekatetavunesozijiz.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/70748161381.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tosojon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=algebra+2+common+core+textbook+pdf+answersPDF 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_off0000fed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED2 17888 bytes
SHA-256: 4da4d31b0c77e6a22d0fff2edf618f851cd6f83b665a92102186fdc9a33d6e4a
font_01_sfnt_off00012d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D92 11392 bytes
SHA-256: 0530ef9c90c7f7be96d86a96103e364a6ed7a07366d6c8d41ad7ea7c2ccebb84
font_02_sfnt_off00014833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1