Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b825a3ec9d07f35…

MALICIOUS

PDF

90.4 KB Created: 2021-10-10 05:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 4a0e207ebbc4e717083386aabbeab817 SHA-1: 596d033848cff9b1332170139c20bab31455f598 SHA-256: 9b825a3ec9d07f3569dc4951966349523cd161c79edfac01ed5e83d8704eade1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://katachizu.com/img/news/files/xavaxino.pdf In PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/37241125836.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/matonum.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/84482700633.pdfIn PDF document text
    • http://eurosolar.cz/res/file/lajosu.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/78825779528.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/lozofituzokepurifip.pdfIn PDF document text
    • http://deforma.it/userfiles/files/taleselod.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/xuzije.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/32614134693.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/netitukugatuwadijavi.pdfIn PDF document text
    • https://tcremich.lu/files/files/tunipobiva.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/purik.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3168d66c6d8cf23ce0c2ac46ce4b30a6/finujibagaju.pdfIn PDF document text
    • https://eetravel.net/file/68461938973.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0a55301712cfa8a54896b656d42258a3/reximofezalotusakupop.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ributisolaximokox.pdfIn PDF document text
    • http://agama-rc.com/upload/files/11158813092.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/85321724877.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/fumuwagobulifiluxe.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20211009130231.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/89137f9f006a242aa797ded871bbd722/jupaderejoluniguwirunul.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/forijafopumuduzuteka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=malformation+meaning+in+tamilPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39D 10384 bytes
SHA-256: dbda9ea5af639bc788e5501d95dd5f06dffb4e8e683b64ac31ade5b07431226a
font_01_sfnt_off0000fb0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0F 19756 bytes
SHA-256: d1e79528621c4ba69ccb789eae91ff836ef3493afd7b17465fcf4d3f27dd56fa
font_02_sfnt_off00012df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001460a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460A 16168 bytes
SHA-256: 6cba6677bde0f241d5abe4bd1daabf497e221bd6197b657de4268e87bbbbfee9

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