Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eb94de50552e5d…

MALICIOUS

PDF

82.7 KB Created: 2021-06-30 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8044849ee282314a219dc462148f377f SHA-1: 8ce2fa674213c47b84b420ff835b7aff879e5aa2 SHA-256: e1eb94de50552e5d0b2d089bc19c42d362878671d3b4e1f8745a5791346234a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains multiple heuristics indicating it's a link farm pointing to compromised WordPress upload directories, which in turn host other PDF files. The presence of these links suggests an attempt to distribute malicious content or phish users by directing them to potentially harmful documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/909c2bf4fb0abac84cb9a15765adf323/bonalusopisirugibapumon.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cfcf86af8f75eb2fd5108bb68dfd7332/xojim.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/7c8ffe9df2e494985150fe1b38848bef/34113276591.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/7b92b2b46c1e405310387da7a48e855b/8691772302.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a733a667bc8---65187922690.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/157vuv14mv53bqmpikqbnpbcj0/laratuferarotozobilemi.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/wevotugopelebifosuxeze.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/95843648219.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/sakevuzibebofuj.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/vn66djfplbaec2hpvr6s2ei2ft/18417658720.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/201ac656fed210d739dc0da48385a394/13673357087.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4b34eb8f---23046533577.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/dulajavovoluvasuvisozalub.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/21474790844.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/g2bull5i2bfvn3cbgan5ksmifm/5621118186.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/t1fnu4nnmcdv1cv3ps45gbkp72/77021414795.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c6631874e89---48216295600.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7270dfe6b---namizuruvosabeduso.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/79092428424dba9bd70cf4050fbf757d/24470554137.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/94438865335.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/af94ef6c9efc845937113f4609d9b4ba/xuwepejiremenuvulujofiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=madame+butterfly+song+lyrics+in+englishPDF 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_off0000de06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE06 11268 bytes
SHA-256: f9bd9e5c788272b3263255c63721b24b791e9e260b5743627b00e933214b75ac
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 17252 bytes
SHA-256: 70fe8a3a9c92ac88b9cc658ba771f731b3403e5100b84a4dacb3ac7f59d7c5ca

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