Malicious PDF — malware analysis report

Static analysis result for SHA-256 bface0f16181a3bf…

MALICIOUS

PDF

87.3 KB Created: 2021-09-06 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3ea3fa002f10cf1ea8b5e01dc7e0b79 SHA-1: 81784ac6e4de2c6dace92273762a62b93305d021 SHA-256: bface0f16181a3bfffefcd007d6daa78c5a1ef8b3f228fe20da21ab87c163ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the link farm indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=dictionary+skills+worksheets+middle+school+pdf PDF link annotation
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6df5d91ba---54103631672.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/15074433132.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8246c76738---fatagudolowebuvovul.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/tibumise.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd4b52b2f---mevexorilazeneti.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/mubaxebakezizapepijuto.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091d05e89579---jubefusut.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/nelesebulod.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pc03kmi764k9uoeejq5foaf5k3/nigajomiguzisaj.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/357474624.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/32lbf7tn6o93mja3i352rjt9d0/mezufaduvaxabaj.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210815051854.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/45803245765.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/4tu3gt6qlckcjm1gs230t793fl/renabego.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210608234945_ph7ewx.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/sasogilanub.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/77293251957.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8547eb9ee---87605969553.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/96015974413.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160835a451b370---87046183309.pdfIn PDF document text
    • https://immobilgold.com/file/88730428692.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/bolaxitenolilux.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/xozajapagepefeg.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ef2bf25b5c8fbaf6e6d2143048f2338/bilax.pdfIn PDF document text
    • https://stvorki.ru/files/file/zinazewoja.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_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11176 bytes
SHA-256: 9f2d8fcca182f6dbaf80d45f8813e69fb1c57f53b348aa260af3a3934e8c37b6
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 17448 bytes
SHA-256: 8bceadeca7b0564fbfde8425ce653446178ce53b41a25ecb3fd041fe1fe9c379
font_02_sfnt_off0001353a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1353A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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