Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3250021640c7e8…

MALICIOUS

PDF

92.9 KB Created: 2021-09-23 17:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72561cde9ff18f7425cd0f47625a4c58 SHA-1: 48f313e12455c849850b6c980563190ee11aa837 SHA-256: 8d3250021640c7e8d27eba0bfb6bf8d26b0fec2a80a4499e722bc8793f3884d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://ahkjt.com/upfile/file/59799035233.pdf In PDF document text
    • http://planbmedia.hu/files/musumokikewijofen.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/goxezamafepikobuxolokop.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/tunatuluwuwajifawamifad.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/caf7f5818814a44139bb273c98b42bc4/segazabugemanejesoxi.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/3b1585cb67ead2fa45c30ecf72724dec/91762866892.pdfIn PDF document text
    • http://0048.pl/48files/file/66639329699.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f0df43c3eb6097470b5ec4922cba1b2d/gupiduxuf.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/legapojitexaf.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/movetumikaxetivemimuja.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/66406918899.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/94308889142.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/kizapevi.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/9855bef100c4a3dc9c624ccb5e9caf06/juburek.pdfIn PDF document text
    • http://reflita.lt/uploads/files/dalipabulowuvajove.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/fejizik.pdfIn PDF document text
    • http://darstin.com/userfiles/files/20592261274.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/wizufetebilozaworubuz.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/jugirof.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b8ce3965f4b859caf69840990a566313/721921425.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/11325105248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=percy+jackson+heroes+of+olympus+pdfPDF 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://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_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 11132 bytes
SHA-256: 64f1e05a24aaa697e1b5589f3bbcdccb8def9f98efa193b6ff7e724de516ac65
font_01_sfnt_off0001254f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 18068 bytes
SHA-256: 37958e912c72796028232d57ab16968bb5e7afeb99d6983916c3eb2298dc5657
font_02_sfnt_off000153f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1