Malicious PDF — malware analysis report

Static analysis result for SHA-256 010c2edfb4279ab2…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 14:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84daa6f455a5918dc5a28892d1e7f43c SHA-1: a814b903e42314ee22e34fc67200d42df99fcb74 SHA-256: 010c2edfb4279ab221b9dfd19341d2e27d453ef787b5bbe828712d47c619f522
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings clearly point to a link farm designed to lead users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133e5f60398f---67268831141.pdf In PDF document text
    • http://inbond-cn.com/userfiles/file/6091276149.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/5fd1fb17502df5c3082d40dbe86efd4d/93786083843.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/67596908464.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/9635415713.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pemalemawiketiremufep.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/modavoxekafubufosaz.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/81036416512.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rurutametinolomofoxevel.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/54902182299.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/74343984377.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/m481lf84dqb1qeogua22pdqc8i/14849753330.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/27732493553.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/2691481454.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/pujuwexowanejuj.pdfIn PDF document text
    • https://csodamalom.hu/files/files/levosolodipebukubixutunin.pdfIn PDF document text
    • http://client.diffuse.info/files/78229257750.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kbhj961o4kda11blc04olhb6nq/66446736374.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/tufufus.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132e645ec5d1---nemimoborazuxuzekej.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/segemuvetakefumipoboxupa.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/22354259035.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebee762a37---fibosobajakagol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=life+on+top+putlockerPDF 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_off0000c45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45C 10292 bytes
SHA-256: fd479fc578576e45bd7d1aa0f2c4e63b91141f10cf51873ea2cb8619b4c2486a
font_01_sfnt_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 16836 bytes
SHA-256: 88e6c3474a5699e0ea3d97feb8a8d05848bfbb961dc3530e2816528a11a3fcad
font_02_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1