Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1b5cc573afdf7e…

MALICIOUS

PDF

79.4 KB Created: 2021-09-07 20:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d0c5f601671a89374102faf0fae55bd6 SHA-1: 71922c621d6c37762593317edeb39f68ab933a56 SHA-256: 8f1b5cc573afdf7e4f5e05d66082013efe3922c2ae4509f14d9cbc3cc05b3ffc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised or disposable domains, likely intended to lure users into phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicate a pattern of using low-reputation hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://anupbolivia.com/images/files/wekirixumunotagupenitelo.pdf In PDF document text
    • http://eventechsite.com/files/files/92513971378.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c5ab3691e---guzudexulibipilutuviger.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/626e92cd53598fc2c97ef14d146f82f1/nenejawuxawa.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/2126580823.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2272619a2f8fa70f0c2d59ae86311592/fomawikusisejeb.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/bafikobabuluvi.pdfIn PDF document text
    • http://tfwdynasty.com/clients/f/fc/fc55782506b94f933057639757072b2a/File/24433108896.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7ce5766b7---vawugasibiper.pdfIn PDF document text
    • https://bem-sa.com/img/file/fowibogimeronaxemajozilos.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090faf351d8a---fopuwamujisivaguk.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/fuzipejufigoj.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3a7a46fae56b25b7837f9b169441444a/67432603544.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/gikodinagirizo.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/mepetitinimabulegilevut.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/8985797004.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/23039990373.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d896ba258d---dotez.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5ef5615a2---70576301321.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/60812828788.pdfIn PDF document text
    • https://binhvi.com/upload/files/kalimuwederiridapupude.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/862104ad69d50306079299f1afaf3ade/10476001443.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d531648cf5---buwinizisodarup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+flashes+said+nursi+pdfPDF 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_off0000c50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 22504 bytes
SHA-256: 66dfa732cc8def71e7d94cee5a54eeb920bac80fda4da2e4b7c2d49f7f33cfcd
font_02_sfnt_off0001189e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189E 10440 bytes
SHA-256: 35a65cff6996b7dfbba29ebff129f88b779a02a7e4e7d8aae865f9315a9460eb

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