Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a03f076efd01f69…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 18:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45ebbdac96fa1ee5e55b678d067b71ae SHA-1: c7dd2b2a60a47ded7b62f4c55591e1cab67adeea SHA-256: 0a03f076efd01f692b6234a8c2ccdb41f10dc47de0b2d6a10efc2b2eda6d4e82
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.valathors.com/ckfinder/userfiles/files/rofetelisolafen.pdf In PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jovigiv.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/28541896636.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/35565220978.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/90079707083.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/motusepededofigu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/mozutudovavi.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/8719790016.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/08e3fe1181d2a21a990d2e10ca89262f/nibafewagazarerigaro.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/26678556067.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/18525187766.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/nulux.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/72549537611.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/wapoxagufokajupa.pdfIn PDF document text
    • http://surausa.com/uploads/files/nugawepopabufagulula.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/7966829179.pdfIn PDF document text
    • http://koddous.com/userfiles/file/wimumegega.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/a63401bb9ff29697878a8e524a7bfd6c/mudekoxabosunivovufemimal.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eabf4578a---vemukerenamiriwi.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/pogavopuraxosadevaro.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/kanejokaburulemisebisova.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/gixofibetemuvidug.pdfIn PDF document text
    • https://service-panev.com/userfiles/sumusevabawobisade.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/gamasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=install+metasploit+framework+in+termuxPDF 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_off0000c65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65A 16776 bytes
SHA-256: 9a02bab5c38c34f66fdcf1cd702e7fe0d4886498ee1250a251ab9f15e1716e99
font_01_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 10848 bytes
SHA-256: bbff16ea98d5eeb04beb1c36314b74dc10506c9f91d57d5db855a81d4b2be6d8
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1