Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3802139b742f41f…

MALICIOUS

PDF

91.9 KB Created: 2021-09-09 11:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cdf859184771c6665f8da8b4d3c38f2e SHA-1: cd328b34549fe038575b19a99635730087e09688 SHA-256: b3802139b742f41fec906d6efd9ddf3afff2129f2fb83395b2322d4baa1f76c3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded links are consistent with phishing or exploitation attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ctjt55qh5etkf1fhr6n36t6ida/nulixomozas.pdf In PDF document text
    • http://gesundezellen.de/neu/userfiles/file/palofowiboluzesi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/63882835837.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/vifimositadezed.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/todadunaluvezidopuxiruval.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/padebipijikevetijoxumev.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/43145343677.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385a2a9701c---pojarawapubovisop.pdfIn PDF document text
    • http://rrarental.org/upload/file/27103943340.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210904_2E8B3E5CC27DADC4.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/rapefapinibunuzijigasu.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/76559866763.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/64280846290.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/15503747549.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613247df3adf6---18250325161.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387465297c5---95503839567.pdfIn PDF document text
    • https://sadex.pl/fck/file/7001908448.pdfIn PDF document text
    • https://masihpt1.com/contents/files/xabagudulabob.pdfIn PDF document text
    • http://boldogelet.hu/media/74748416415.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/6431216600.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/8742454752.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/47259684836.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/denevamab.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vigarif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=class+of+the+titans+movie+castPDF 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_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 10600 bytes
SHA-256: 871f996306bc69fdb3bbcc938f00d27c626d54bd94517ea941f025dc8a0f0dff
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA0 19352 bytes
SHA-256: 2fde48d960ad01ed4daad6677dbf2c333c52ddbb4991256ef134f4815328b773