Malicious PDF — malware analysis report

Static analysis result for SHA-256 75358394a7a61017…

MALICIOUS

PDF

97.3 KB Created: 2021-09-06 14:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13c02d81e0dea3168a0e8227327698dd SHA-1: cd6c6719d75f0a19f17dcf84aa3e06a340317e4f SHA-256: 75358394a7a61017ac1f07507328cf0fca13bc92145a511d47a3e1929903e20b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or redirection scheme. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics confirm the nature of these links. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to malicious content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://irlanc.ru/uplcv?utm_term=physical+mutagenesis+pdf PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qe41bvomr9jgo5l4jpd7lb8tev/bubinabin.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/80795589431.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/bupojapozibifozitojuti.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebe522fb3---73012655306.pdfIn PDF document text
    • http://soundupgrade.nl/site/data/ws/files/58629380209.pdfIn PDF document text
    • http://1careglobal.com/upload/files/99039523131.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b256e2e80---85539715100.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kowotedawod.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/vufiwavelijukekidesix.pdfIn PDF document text
    • http://www.toptehnik.si/images/pegefuwowelijipegodo.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/sudabula.pdfIn PDF document text
    • http://accronline.com/userfiles/file/41837633493.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/1724494069.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/83297881783.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/53700142179.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/tizovijizajifese.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf09d2f6a9---48130144821.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/67399806685.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b6819d09252---99986277359.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/61502044784.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160a0629adcb87---38118551196.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210714033019.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/72173496782.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/70512134104.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/93063569701.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_off0001135d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B74 11060 bytes
SHA-256: 68d04bbd96692ae85987737f4f8c1d03aac0f484f89fb640a4cc24f1c8a25bb3
font_02_sfnt_off000144df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DF 19252 bytes
SHA-256: 20bc4457356fb1f0e4161018028299f4626065313780ee08d6ada12637a10297

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