Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ac631ca852c58a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 11:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 703acbc9bfa007deead4bfbac0d42dea SHA-1: f2daa67ad5499c308e95655c93c99e273dd08510 SHA-256: 21ac631ca852c58a780f051cea18910c6d2baecbace4844be18c1ddd78b4bac4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://laborke.ru/uplcv?utm_term=can+you+transfer+episode+from+android+to+iphone PDF link annotation
    • http://www.ecvbrass.ch/user/web/file/jejiraburebotivep.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109090633575071.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/supogojobewil.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/rewikosiwoxatogurivufin.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/jmdqounnbioetd03hd1mi9mau4/31983278587.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/26498863880.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/13930334114.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/f8db296e586bded0f156abccc46c30f5/basukunevenojebevixogeve.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/64823382349.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/10857148840.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/12028302472.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/milidodox.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/galajolodumorodi.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/26800833925.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/31708023023.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/41940644881.pdfIn PDF document text
    • http://ed-union05.ru/files/file/29739512489.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/98156288539.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a51e0cabc4---70572472548.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140e932388fc---68705920234.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/gewor.pdfIn PDF document text
    • http://oodow.cn/upload/file/210913180946130762wu6urfhlac8x.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/pazupijuji.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/juzigorelapowopidoriluwiz.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_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 18032 bytes
SHA-256: 31450daa46a7e6fe2958f7c8b065e394790283b82ef454498e72eb3c440775ab
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10964 bytes
SHA-256: f4a0f80b59b1aae8f65346928f6b9960e3a64a5c2b7341dea7462bba49db7a91
font_02_sfnt_off00011faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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