Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e875746de9279d…

MALICIOUS

PDF

83.5 KB Created: 2021-08-17 00:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9c5e60830f35255a8eeb552737d6899 SHA-1: 71f36306268bfdf60cdc1b4e0538d0cb957eb869 SHA-256: 87e875746de9279d324fbd2811d16b2e1d2a62ebc286b2761df7d22849a2f8fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting an attempt to distribute malicious content or manipulate search engine results. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://files.ibiza-ferien.de/file/78866402122.pdf In PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7h724pk4orjn07arsbcfhsu0sp/nulosa.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c37d0b03711---86629602096.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/85285125034.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e41c53c8f---jimoj.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1eafabedb5016c16fffcd1e77a711b51/vewuloxe.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/samapimujeki.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/54153820157.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084990bf2c9f---modipekenonelotimilosire.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0adeed7e233c3b536ccfd0039c2ecfd7/50263341423.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/solepizutowisunelaf.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/17669515938.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/539fe4079ecb359d56e7ecba0dfa8bb6/86713982571.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/zixowugufutafozedo.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/49432033486.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/fuwosutetevu.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/1d341e4cc150c1e06ffb3a22292d7de8/vafewuvomuligijeneke.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/72299460848.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/28546229877.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/30643900023.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce85cb6ffaa---39795509394.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/95635921459.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/zodokowawaxogevewumeruz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+disable+msi+afterburner+on+startupPDF 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_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 17064 bytes
SHA-256: c28a0661ad175df97e62bb634be0929a06d8312398012dadd06a7f131322e290
font_02_sfnt_off00012645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12645 10976 bytes
SHA-256: 55ea5ac4465adda9774c48cbe2535dbd90e1615e6b0b60809b1eb7d5a3aad443

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