Malicious PDF — malware analysis report

Static analysis result for SHA-256 493ec4385a317a96…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 00:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 14aebf29664d7a034b0bc319e6d4e8c7 SHA-1: 34f5b2ddcd034ac45cf379204856ae0e5009eb40 SHA-256: 493ec4385a317a96069c1926893fce6dafb80e2f866e2d29607c06ebea1bed68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/5a08aa9119cfd172b73a32ea089eb0c3/tatove.pdf In PDF document text
    • http://styropapex.pl/userfiles/file/83747944958.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/63119793286.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/42041491627.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/89880570999.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/zififilokorovuvulipuz.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/466078573.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/guvanevelipegavibuwuko.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/dulenuxexizelo.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/jawipelaxewusorapufa.pdfIn PDF document text
    • http://precisao.net/files/files/76298461527.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/34601219034.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/97ea1116201fee6fbe91582c8366f434/66348077097.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/94025096548.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/80443253279.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/debejifatofu.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/23566783859.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/84885095852.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/najozetawijumozix.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138095f68abb---bajagogozexazujumefax.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/jodofikeralatejuto.pdfIn PDF document text
    • https://vilus.cz/userfiles/file/totifaritinugawen.pdfIn PDF document text
    • http://blccy.com/userfiles/files/tekijezonalixixeforuduwo.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/maxodimafawijijirupopuga.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8b5946111b6ae4ac7bc8e453aa9362a4/95535214787.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/fiduxevoboxuja.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210901121240960257070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=redeem+code+for+save+the+world+fortnitePDF 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_off0000da91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 10936 bytes
SHA-256: d4cbdde9346010513e12418a00cfeda34f890059ef33edd579f19d407c87bd3d
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 18480 bytes
SHA-256: bccaf4811c2c6bba47fcf81d02da71d4a12118850c0e23b4b1751f6bd4aa1c24

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