Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7215f8f92ea3db…

MALICIOUS

PDF

86.0 KB Created: 2021-09-06 04:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: db7b80a27ac679f304dceb4f516a5d28 SHA-1: c4d77943109d40e4d0933e958f9a2481fcbc9e74 SHA-256: 4f7215f8f92ea3db9c93719caa4772df94818b8f5b9a674fcf9166688a0796d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect the user to a malicious site, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=the+cambridge+handbook+of+english+corpus+linguistics+pdf PDF link annotation
    • https://dichvuketoanvn.org/uploads/files/42561850740.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/366ea468f588da9080dc3cc43c4ea1dc/36987722951.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/59398871255.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8255de33b---52843666243.pdfIn PDF document text
    • http://valeneighbors.com/userimages/xewejib.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/dalovebib.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e313ce8ba0---14628245622.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/fajetolib.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d58e65b651---sitaso.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/687e2fa480d9fed27715daa55b47f031/gexujozarapuruxu.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/19241885292.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/zirogobukuke.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/40620630210.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/57702292640.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/gofokarojowuzubezapuvanep.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7344297ead---53927044121.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/41589494206.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/7f0ff94bd2bcd5c80cb4e195b0f87566/bowevakijuvatifawiv.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/8094231611.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/763340689328bd0f860c9cafdbada775/83497870199.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/letulenuzovixavasegizira.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/bc3217d070d9d6cf140167b0ab6eaa5a/sivizadasi.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/1915d56fd7bd5a86e970a8bb9b32e59a/16242498537.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/28703599229.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/79736554267.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A6 21064 bytes
SHA-256: 347014c8a46148576babde729ad3907b6eb88719612032921c5f72e2fbecb008
font_02_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 11364 bytes
SHA-256: 7ade8c34b751e28b33faf83e5a28bcfff88036e78ffd2757b2ee71964726722b

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