Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b46a152a60bbb1…

MALICIOUS

PDF

89.2 KB Created: 2021-09-01 16:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ede782bbe63d0e9f4a94364caedbc4b SHA-1: 2efeb279f2b230fd06a19b8ccd1e1265dd97a199 SHA-256: 50b46a152a60bbb113e2f0d6a7c6306e7d65da0fa32923f962db87ecc94e44a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bbpcosmetics.com/admin/upFiles/2021-6/file/84293239479.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06a4a349ff---61050359540.pdfIn PDF document text
    • https://linardi.ru/files/file/zifumixufoli.pdfIn PDF document text
    • http://homeopathyhk.com/files/87223162106.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f320243f4---fumimofoponalakajevofe.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/32290398854.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/50658499244.pdfIn PDF document text
    • http://reunionclass.com/clients/7469/File/pewaditirarofizilo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b971ad204bffb92ee92e1f0990254ed2/birijig.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/98051594760.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/29667322646.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nguurbnahdvhm3fjr6rro7qogf/1214340228.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081af6db06d9---58684889258.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/razed.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a013f34a---42514154669.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/34362dbdbbd7bc0e7348f15cef24b34b/bagatomugelez.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/kujidafegoxatuwesetizomul.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/novas.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8ce4a9aaa04539be04243432985fa970/kuzeko.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/welizonidorepu.pdfIn PDF document text
    • https://ekransamara.ru/files/mekudijifolurif.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/ditinemef.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/tumedumakenajezaxigatowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=is+seeded+bread+good+for+diabeticsPDF 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_off0000f52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52F 10592 bytes
SHA-256: 12d1868ddf0e3b80cd4932cb5cd15c887197d2ed0e7e9c3b9bb7efee06e00ba4
font_01_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 18076 bytes
SHA-256: 7292a4fc5f2e5a2e5815fd6d7bb826ed28cde058785aa479df6468b378da2a50
font_02_sfnt_off00013c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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