Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f008fe0f73e59a1…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 02:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 63a144eaddfdb436d85ebe9feecba4f7 SHA-1: 66758d65f742e41a652c3f7444c4bf76a83baf7a SHA-256: 9f008fe0f73e59a1c840119efa4cedc27bf4e71466d172d84f07543057ff2898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be SEO manipulation or redirecting users to potentially harmful content, aligning with a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2r2ksi061goleobltdpafmbol7/45960470836.pdf In PDF document text
    • http://lnyuanzong.com/uploads/files/20210806080704.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/50983229270.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/14174729893.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f182a94d8452427690b0a7f11ef35919/46975022085.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46890d3b72---xabupofozitanixamisoxuvex.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/52282900300.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/82314867510.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/69140772804.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/0e6a50e75392e1e7ae0b5176a286af65/pizapefolojobixaxiderinaz.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/fogenadosegi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce878336c---xowupepododuxogalegina.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/gokokuvelubugixedubape.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4569e103ea---susedunezonuwizoguziwewe.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/44660345985.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vitipaziribe.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/a1229747db2a7f10a092bc2de838edd9/30911064941.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4ff8b2b155976b9ae686dd9a84219651/xokitosafis.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/70012644374.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607420c3066ec---mapesajezanubewuxex.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/28965854102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cluck+u+chicken+menu+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/tiguzoroxabawirapomupavo.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_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 18932 bytes
SHA-256: 7870b71e535fb8f4b00e851dfaafdd075fc4be54e449da5f5814308b1b40d24f
font_01_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 10460 bytes
SHA-256: 34189875d67fe4e66b90d244356f850cc5d59268ed0223bd7e4b812d321b5a9d

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