Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7533ecdff42b9c9…

MALICIOUS

PDF

72.5 KB Created: 2021-09-19 22:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7fe799fea0f664a5c488061f2eef52d8 SHA-1: acd222f6b19a085aefc28ac5a8d9b4c3e3ee5a1e SHA-256: d7533ecdff42b9c93c3078885addba1f8607d116f49755caefae9638feeeadfd
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://mimpishio1.com/contents/files/xizezudozesapejovenepuf.pdf In PDF document text
    • http://interno-kazan.ru/upload/files/63548382825.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/1209313299.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/75406531182.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/9u4vaosm6532mvrc6o78gr14b2/18088836143.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/torinixatet.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/xuwewomi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/bf6e90415579a859a9df38ca884d04ab/50568379976.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/19438980051.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/47958618765.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32805490500.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/voxel.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/2820289335.pdfIn PDF document text
    • http://climtech.com/files/files/45310383673.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16142402d330e1---25640708678.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/vurofomesozofikivefizejup.pdfIn PDF document text
    • http://fitviewer.com/files/file/35646493739.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/83701212194.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/55667576206.pdfIn PDF document text
    • http://hak-al.com/resimler/files/talibojujajavewalulon.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bikobamidurevare.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/0351e4dd0cf74af070283cce4ee198c8/raxarazewitujeg.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c10491eaf---nivuxumuxobojazasalawerew.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/94178177561.pdfIn PDF document text
    • https://almavilag.hu/files/files/nasuwavowafu.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/35080727691.pdfIn PDF document text
    • http://showdoimovel.com/files/files/64932124531.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/68420037867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=whack+the+teacher+unblockedPDF 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_off0000bd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD6B 10532 bytes
SHA-256: 2cf3b6049fee266099f7c5970fd099d207833afa27311363073e2fffa3e02678
font_01_sfnt_off0000d55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 15160 bytes
SHA-256: d977b444440938d7b43544644903366cd1097fdf73c4b076b576edced434901e
font_02_sfnt_off0000fbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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