Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd6b65af1be9db4…

MALICIOUS

PDF

98.6 KB Created: 2021-10-17 12:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 40d9eda77ab6312d663932a666eca62a SHA-1: 95242e87a2a4b8d2ab4989514f9dc2b35a8e6d12 SHA-256: fcd6b65af1be9db4742227f77b4b2aa892b1609669556d627d747a905f5e721d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://oniceh.ru/uplcv?utm_term=prefix+for+people PDF link annotation
    • http://www.frank-diagn.hu/userfiles/files/57511048887.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/pesitotefanowo.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae8adbc117---35060015754.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/62641431084.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/55537673589.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/fozorajok.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/xoxukekodelesovon.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615660452221f---51352741753.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/35704024525.pdfIn PDF document text
    • http://carbontuning.ru/file/99365750571.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/fatifetukupinovedogusaki.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/67683486268.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/3032491167.pdfIn PDF document text
    • https://chptravel.ir/data/file/81526368209.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/84631383523.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/14926975748.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/57946499899.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/610cea39ec0f59df89cf8505b37fd7a7/81791647874.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/4912689312.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f043d48393---lulirateve.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/30857306397.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1633632393.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2a59aab4---jibelazib.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/13064960156.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/74872785135.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_01_sfnt_off0000ecd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD4 9920 bytes
SHA-256: 7caf74f8f005d990ac8b1ffc94124d7381b27cbfdefc79da8612f3c313f2052b
font_02_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 18116 bytes
SHA-256: 446a0f76e3325560cbe410348fbd22f4ad40f4de56d436e4ef46b7145261435b
font_03_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 27416 bytes
SHA-256: f689cb232f22a28c489136209b3c63a526fa21c6123244b7e49e2c5715a1d8aa