Malicious PDF — malware analysis report

Static analysis result for SHA-256 160bf11b5239f01f…

MALICIOUS

PDF

84.7 KB Created: 2021-09-20 15:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 293668641cf1c5b2da54a1349842c908 SHA-1: 14d570387794e234e878674983cd1c98c73bbcbb SHA-256: 160bf11b5239f01fd9b0c6437bd213a4f0b005d30b4cd1039867c25ce3520e4f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document's purpose is to trick the user into installing malicious browser extensions or updates. The presence of numerous external URLs, many hosted on compromised or disposable domains, further supports a phishing or malware distribution scheme. No scripts were extracted, but the document's structure and heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=cara+menambahkan+adblock+di+chrome PDF link annotation
    • http://wo-kop.pl/userfiles/file/34476977286.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/mizezonorudiminu.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021916_11117_814.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/taridibiwipe.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/rubopovarabuzokisaxeneve.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/66390608880.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161382c5102988---88669173714.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/semodoluvekibibi.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/19/datomovonazamumudesatolu.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/xuzelap.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a6456e2fc---dopanukuf.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/pejezewapa.pdfIn PDF document text
    • https://music-group-store.com/upload/files/68984552110.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/73232771065.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/161321c929bdaf---83502254049.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/1021538821.pdfIn PDF document text
    • https://kueapem.com/contents/files/zidubutudij.pdfIn PDF document text
    • http://zerosquareonline.com/file/jukosozunakijaxiwixusive.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/ginagadibidu.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/64597972165.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/50631625913.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/delorubafixaganunoxoz.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/vopasodobodakovefir.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/48194560413.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/pivojaginu.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/62675459840.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 10632 bytes
SHA-256: d4416d12b49eeaa9ddaa8b9e44774d9fb7cf12a3395bcf26ce4e48499b882f8f
font_01_sfnt_off0000fe16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE16 17852 bytes
SHA-256: 1c482a25528b5abe09ccb671405928e6469840f108be8a5b1dbb5bc93fe9856d
font_02_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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