Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbad70bee2ce2e48…

MALICIOUS

PDF

86.8 KB Created: 2021-07-17 23:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: db7b4f0510e1ae598f1250e0a5757a77 SHA-1: 8bfddf30c2498eaf03931a468148c4df72662e55 SHA-256: fbad70bee2ce2e488c77aa49d2f317a2daf5c9fd8ee34537c5a37fd92082cdd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, all serving other PDF files. This behavior is indicative of a phishing or malware distribution campaign, where the initial PDF acts as a lure to redirect users to malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://teerosy.com/ipp/images/uploads/files/70927429202.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/25cc4e8e6d27c989d85e427636cac810/29037431010.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/jodusovularuneparu.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/62223566990.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/6603398131.pdfIn PDF document text
    • http://waterreducer.cn/d/files/89527369135.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160787d16223f0---bojodemifagixujajal.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/72401754740.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62a3653662---kevitelat.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/77588098951.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811b634863e---35444818124.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/gopinopenegunofowedal.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/rowakokijupalasifilaj.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/vejite.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/mopaburagonifedezaxon.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/14454792343.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772e97404c0---rezajenerujowi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072050c7e0bc---91104839948.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/lsl71klmdemqgqnb5rf7pg43gn/19773813927.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c6f6950a---35812106784.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832fe4e6b2d---muzudalubuzipodalubusar.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/50415313377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=binomial+expansion+of+partial+fractionsPDF 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_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A1 10796 bytes
SHA-256: cdf38fabd85d25c2a70b152f4395ca096e4d8b80d2e2f412772737567b2273c7
font_02_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 16972 bytes
SHA-256: 725eeb6dbfad0752e840ab5f1b034673903bae1a2eb541115459d660f5cacbb8

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