Malicious PDF — malware analysis report

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
• PHP webshell / backdoor source critical WEBSHELL_PHP
  The file contains PHP server-side code with the signature of a webshell/backdoor (named PHP webshell banner (WSO 4)). A webshell takes attacker input from an HTTP request and runs commands/code on the server. Flagged as a malicious hacktool artifact even when carried inside a document or archive — the code does not execute from the carrier, but the file is a webshell.
• Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
  Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
• Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
  PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
• 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://xajibur.ru/aws?utm_term=how+much+does+a+verizon+router+cost PDF link annotation

  • https://static.s123-cdn-static.com/uploads/4409255/normal_5fcc1a214ac46.pdfIn PDF document text
  • https://xudekumuf.weebly.com/uploads/1/3/2/6/132681038/zejonufunoz.pdfIn PDF document text
  • http://joblanc.xyz/large_numbers_worksheet_grade_43xnz4.pdfIn PDF document text
  • https://vugalemudapitos.weebly.com/uploads/1/3/1/1/131164275/4661810.pdfIn PDF document text
  • http://fumigatoff.online/sky_hd_diskless_modex954u.pdfIn PDF document text
  • http://vilopeg.xyz/32019228295oddny.pdfIn PDF document text
  • https://cdn-cms.f-static.net/uploads/4497646/normal_6013d98bd7e6b.pdfIn PDF document text
  • https://nazesamujev.weebly.com/uploads/1/3/1/3/131397942/nanov.pdfIn PDF document text
  • https://cdn-cms.f-static.net/uploads/4486206/normal_6033fad3cf859.pdfIn PDF document text
  • http://ijmalan.xyz/lanexudufozusisobegap2n8f.pdfIn PDF document text
  • https://fakosizok.weebly.com/uploads/1/3/0/8/130813800/9ec81fc675.pdfIn PDF document text
  • http://www.ascendercorp.com/In PDF document text
  • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
  • http://www.daltonmaag.com/In PDF document text
  • https://s3.amazonaws.com/gudukupir/97302507006.pdfIn PDF document text
  • https://3f740848-0e57-4b51-8596-564812021bec.filesusr.com/ugd/cbe17c_aee2fcf35bd341bba88c8b58367d0d01.pdf?index=trueIn PDF document text
  • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_24a588a43d6a4ac186f97a57ee74ec4e.pdf?index=trueIn PDF document text
  • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_ea656d89804642de827edf9f35f7a8bb.pdf?index=trueIn PDF document text
  • https://s3.amazonaws.com/dixaleko/how_to_clear_text_on_dymo_label_maker.pdfIn PDF document text
  • https://s3.amazonaws.com/dotivaf/el_error_de_descartes_antonio_damasio_descargar.pdfIn PDF document text
  • https://s3.amazonaws.com/jesidofefe/acrimony_movie_nairaland.pdfIn PDF document text
  • https://56f9ebfc-1b58-4ccd-90b9-24793863e956.filesusr.com/ugd/0f3536_916da150321a48c690c2c4dedad42d07.pdf?index=trueIn PDF document text
  • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_fdf663908fb847df96563953cbd5a21a.pdf?index=trueIn PDF document text
  • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_fc2b3e5bbbd1482d89165b97db6e09ff.pdf?index=trueIn PDF document text
  • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_c5d1f9072267402ab2e536aeec4e84ad.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

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