Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd57f77084e15f1…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 14:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e005980f7589f6c7d0ab54fe82aca973 SHA-1: 800a5ef0cfa060472e94a2c454a5afb4f15807b3 SHA-256: 3fd57f77084e15f1aeb2cfaf2ca092b4d3077c00db897a6e708fee0c06303a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to distribute content, with ClamAV identifying it as a phishing trojan. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://smidgel.ru/uplcv?utm_term=vector+parkour+game+download PDF link annotation
    • http://prompol.com/media/file/gamaxaxugokoxo.pdfIn PDF document text
    • http://ellev.fr/upload/files/rebikomufaderif.pdfIn PDF document text
    • http://ippon.lv/uploads/File/xutunafasunizetola.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161357cc93019f---70069245468.pdfIn PDF document text
    • http://htygroup.com/upload/files/17588300345.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/45848246002.pdfIn PDF document text
    • https://cncunse.com/d/files/pixivagagoponinino.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/97756090361.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/11964244241.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/rodonaganuzikemazuwiw.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/5418150216.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/81631218446.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vujogovas.pdfIn PDF document text
    • http://njxinbell.com/upload/files/raribesavowokoperase.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161393e748809b---4248593644.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d66c81f36b---56346788293.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4c45e7de8a9421af40edd87fa9b18c23/57498143413.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c070eec464---nevowojiwijejizuk.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/81936603217.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fukepem.pdfIn PDF document text
    • http://mayjack.com/upload/files/20578999239.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/15539686079.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/wajidezodukukazizejavari.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210911231658_j9996i.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/pefezagige.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/wubuzotifijebatiraki.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_off0000c05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05D 16452 bytes
SHA-256: a36fa960d45a78ac00130a82f1298d007fd62b0c1c9b1ce1814c220a7e90ddb4
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 10844 bytes
SHA-256: adf260037dbb78ebc7da07f374be64d0c10fe67dc695d0dc18c755fb632852d3
font_02_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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