Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc70ab0789d3197b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-02 20:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b10fabf1ef2f3ad3dc012dd75fdb4f69 SHA-1: b2132f89072fa8536b3ee184c48a4c91a7f8bf13 SHA-256: bc70ab0789d3197bf559dc336cdf75e53c72247dac24c7c9dcfe3eaca1e79b11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's designed as a link farm to distribute further malicious content or phish users. The presence of multiple links on disposable hosting and the use of UTM parameters further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2b4c15de1---97410731535.pdf In PDF document text
    • http://kmjmt.com/news/upload/file/2108290226395696877a7i3f.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8180da1c55c8da74f1c933120f9ca84d/zupopafazesanazadubewibe.pdfIn PDF document text
    • http://huiking.cn/uploads/file/141748354774.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/9692088026.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/makinuvafuje.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cd70414df44c96846619aac76e64f9ea/11059055235.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tavukagalunesarajiz.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad7b0daef---naruwerilavupuge.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ddad50ea---mujusanudabov.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/43321652344.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/16128799007.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7548f43053---rarawuresubelite.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/31394407783.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/59729510538.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/rilip.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/44931020822.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kidinenajux.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210729164341.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/sizagifonuzaro.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/3ef3a325146986eb5972d7b48f93d653/powuwumepopij.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3bcb6095b6---jinejupejexetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ocr+pdf+to+text+linuxPDF 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_off0000cedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDF 10512 bytes
SHA-256: 56326333084072bbff69b4440b023a85927cec03e6a29de300a8366b3ada2164
font_01_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 17736 bytes
SHA-256: a7b48de39f5f793ce9e921687cbf51538ec7384fd3b0318d0e43ae95401bc7b0

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