Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a0b56318562eb03…

MALICIOUS

PDF

71.5 KB Created: 2021-10-13 03:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 57287fed8d126429c9adf11700dbba86 SHA-1: 76ecdd6585a6d6b7efb041b8c3fde753b62f0fbb SHA-256: 5a0b56318562eb03e38442c606818700d7c4ad9d5dd4317e165691d57c80bf1b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised WordPress installations. These links are likely used to redirect users to phishing pages or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=cell+structure+and+function+introduction PDF link annotation
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/lumaju.pdfIn PDF document text
    • https://upaspor.com/resimler/files/wavojotarenirizovubef.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210929_5F2CB55FB1D451A3.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/lepiwawesirogitu.pdfIn PDF document text
    • https://arhiapp.web-idea.ro/app/webroot/files/userfiles/files/48141839378.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/lujazojuwumibedup.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/55669054824.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615981554d207---tirubakaximinufopifejixi.pdfIn PDF document text
    • http://hadt.vn/upload/files/jexamadezop.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161471bca3afab---luzebiki.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/zogodigusogirorazupop.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/jujetejazemitini.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/tebewewenajabukiviraza.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/delanizogaxu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/jifipeju.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/22883723840.pdfIn PDF document text
    • http://aurora-c.jp/files/files/85678695676.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f903c45b4c---tijoxunexu.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/12034985724.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/fa5ea365047a7df1c1c40e64ce179d3e/kevuwerijivo.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210906163657.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161556e74d418b---427218844.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/60372193662.pdfIn PDF document text
    • 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_off0000b7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C7 10600 bytes
SHA-256: ee5b876a1036309e3bc2bcb926e5207728487fbbec9902feb1aab8abca1b42e2
font_01_sfnt_off0000d020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD020 16064 bytes
SHA-256: feb280d77aa3ca65eb8edf04e235f646d54e177ddc88e26996564c817b76959a
font_02_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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