Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6617fb50d1db09…

MALICIOUS

PDF

73.1 KB Created: 2021-09-24 20:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d8d17ee4a99dee1c321407bc7f69599 SHA-1: f6057a55b2021231c7682a6408f88223a0172bc8 SHA-256: 0e6617fb50d1db098f7bbfcdc2b70e501cee562ab28f7092e03e0a98e6e9a2d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are likely compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, suggesting an attempt to manipulate search engine results or distribute malicious content through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://massarentearchitettura.com/userfiles/files/miresavokabinimewup.pdf In PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/xefidavenegegazezegedu.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/2440100141.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/siwutogaw.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/53287009733.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/xosajamawodim.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/savemodokajema.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/11332198720.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/39681064174.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/gaguwo.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/lenitemute.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/3692156466.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/lttn24icab1cq3tt0gu4q2d633/jaseva.pdfIn PDF document text
    • http://foreverymuslim.net/home1/forevev3/public_html/foreverymuslim/upload/file/golukovudo.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/luledisudezasesumovev.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/86125632442.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/78453263576.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4643808a2de178f587d494bc2e5b08c3/53551205596.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161376ee6dbb63---85792033508.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/lofifupapalijutapite.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/94213356662.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/nifatenudezipusunumelafu.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/vajipotur.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/90947886622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=remote+desktop+connection+android+to+windows+7PDF 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_off0000b69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB69A 10904 bytes
SHA-256: 052a47b9cf5156079326eab57a74c6e36744e7a9b8476019ca9d1fddc685a538
font_01_sfnt_off0000cffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 17568 bytes
SHA-256: adcb57dfefec5c9f1dc2aa6a45643ef2ba5c222423a3075dde79d6e77f165d61

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