Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5534d324ea8b9a…

MALICIOUS

PDF

88.0 KB Created: 2021-09-15 20:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ab21c16527da63547f9a1967d9e6b47a SHA-1: 7b8143e14bd6fc7162b13cf817ae740b8fe66c64 SHA-256: 5e5534d324ea8b9af073b35ae23517c33b1103e1795a1521bded89860b8babf4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the nature of the heuristics suggest this PDF is used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=how+to+transfer+photos+to+computer+from+phone PDF link annotation
    • http://mrspk.com/ckfinder/userfiles/files/rigov.pdfIn PDF document text
    • https://kaparatt.com/images/File/99786895493.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/tajeri.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/fe9d06bde9c485f80ed5c2f70a029d73/61216298536.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210913193625.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/62896461032.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/26812068706.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ed577d1aac16dc069090ce3f8c866c6e/82341962227.pdfIn PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/43665970910.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/29197530812.pdfIn PDF document text
    • https://arerp.kr/data/file///44581565289.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16134f11e69d72---doroj.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/momiwufo.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/2657268931.pdfIn PDF document text
    • http://agilesolutions.in/uploads/55078363614.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/dejaduwaduwixipobib.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/99612033078.pdfIn PDF document text
    • https://regenerateacademy.com/file/86438861597.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6a8e0591f217560f4b1f2ffd3bbeeca6/razukoborijonu.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nijupoxi.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/46587244423.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/jopipupulati.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 18304 bytes
SHA-256: 7e9688633f7d695b17480b081a43df822f215b158212d107d2bc2985fd69a612
font_01_sfnt_off0001213e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213E 10784 bytes
SHA-256: c3bb12176abb04e90f8f303a31c62e8979bc9429b9306bac143294093f354685
font_02_sfnt_off000139f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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