Malicious PDF — malware analysis report

Static analysis result for SHA-256 e854ab71e8662bc3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 19:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88562db7a3ec592efaf70af50d60bf10 SHA-1: ef7c2762d5d8fe197440ff9193f393a8ac25587e SHA-256: e854ab71e8662bc318fb9410b932fb7859bfe926a41799232138a3b52348fffb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content or phishing sites. The primary attack pattern involves leveraging these external links for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=literary+elements+and+devices+worksheet+answers PDF link annotation
    • https://norservis.info/files/files/tapusapive.pdfIn PDF document text
    • http://enricobarraco.com/files/datifafokinuvokevu.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rarupisixozojafu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0c8cd7b6b---57583680014.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/11554968700.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/60156154694.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/4q4oktut9bat713aajlg02rkqn/52590509883.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609afae9ee497---kimalodegagelinukitoxawa.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/8763961708.pdfIn PDF document text
    • http://hibertek.com/image/files/20210622_201250.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-8-22/20210822030014704253.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/fatujejuvuporuxusuvanefu.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/zavopowilebarapikimil.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5910574706---42572904074.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86cd83b06d---famuwuzimoxidogasup.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af75d70a25a---52892764393.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/55461773984.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/bugakobetoxuguzogufa.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/5b0bfcbfdbbe8cff633ed56349f03c7e/38597984892.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/tafesaxemivo.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/c4e46f4c045b7ef38a3333c5350b7c9a/3998419410.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/43302807335.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/jixovonenagorajo.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_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 16936 bytes
SHA-256: cdf02c02af03f7d2cd45067045fa46cfbe3670ffb7e16f6db8deea1a5b71f88a
font_01_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2D 10952 bytes
SHA-256: 14dd3d38a72e5c8319ec4e59de5daa6af856756a14583b56c9d381282e133c66

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