Malicious PDF — malware analysis report

Static analysis result for SHA-256 9263bf69e91ae8ec…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 17:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bcf8dff6af7af650fdff19d109ade336 SHA-1: 936b8841b2c50f464637dbae2d15438552a6b65c SHA-256: 9263bf69e91ae8ec53f1cfb31b612778f3e83dd65299d4e10beaa0ff3ddf800e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous URLs were extracted, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=free+epic+skin+515 PDF link annotation
    • http://gshosnab.ru/userfiles/file/xafibaxabilufetuke.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/lufexunaxese.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c1cb443767f67106cb9556817e8ca6c/52799855077.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/zopipogu.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/18975827828.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/30950975208.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/35831683344.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/potelubumebirubevepu.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/pakujaduduvafenijigibub.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/jiwenuv.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/pumozovepepusu.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kizonunixezepibatedoluw.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/dimonesepiwanutufaki.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/wosotirivugi.pdfIn PDF document text
    • https://italvaping.com/file/48387021809.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/reradad.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/68787265417.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/jepezonadebajisesuwujobaj.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/fv42hn57obi948uc6d1no58nub/22128140355.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/dorirawabavasu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o0ocrb5gupakrskai3u1kndesn/jukeropa.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/87675274129.pdfIn PDF document text
    • http://kd-council.com/upfile/files/xuzupuvosojizetasojilo.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/54acb66fb9871c0fa0707f892f1bd4ef/terufikigoxobifovimejoxej.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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 15316 bytes
SHA-256: 9194d66ff89ce04c289d633bbe058bc124534485a456adae2c35380e72156c0a
font_01_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 10196 bytes
SHA-256: b6066b71a6424c2cef72f6e188873a7973109e4410ba7eb1375ef9bfcd8a5603
font_02_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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