Malicious PDF — malware analysis report

Static analysis result for SHA-256 b369c0a554996dc4…

MALICIOUS

PDF

90.5 KB Created: 2021-09-05 10:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bdc4718b903a234f8fb5c81f66b2eb4e SHA-1: 77fe4631667a2f23f42e02c4cc0e0f6c941c1991 SHA-256: b369c0a554996dc46c9d3c15f05bb006cf6162340499f8abdd3684e02200f74b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://studiotecnicoprato.eu/userfiles/files/xufibawejepuxe.pdf In PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/63634884222.pdfIn PDF document text
    • https://migger.dk/userimages/file/gabunezofotuj.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcda35615d---metokokido.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a143719fc20---91589434391.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99eb321c9---61214483650.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608b42d8ec468---30056435038.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/c22aa3f908dd581bf65b47f42d06b6ea/borototafowatej.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/fibikuzib.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/tenusotar.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/60600184506.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/ralajipurepijatetuvani.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/19531738324.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/66998114859.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e957996ca5a---35874992375.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/84632373089.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/39553678375.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3821859f0c---9343233992.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5658e4e906b42a3135b0dd2ad949bb32/23231292356.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/73521552798.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/1370500123.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607928a74cd80---kidizubopaxopasot.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4c749e547---968302215.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xigotuvifipar.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210828181309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=four+color+problem+in+graph+theory+pdfPDF 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_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 18772 bytes
SHA-256: d751112555fec42be8abcdbc3e3def8521caf1205d6cf4e7dfaf98da49ea59d6
font_01_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429A 11228 bytes
SHA-256: 4616c73696aab05ab847cdaa8ca0035f91afde16dae3adb0a3cff0f85d1dde9b

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