Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c8a710ac8da5f8a…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 12:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f9fc78441851e084650dede0d5c38558 SHA-1: ea05aa387ccf2e91f158ba84ec4b337449380874 SHA-256: 7c8a710ac8da5f8a620c681295dab697445ca6b506a77d3bccc8ef6467d930df
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://pixomot.ru/uplcv?utm_term=simple+html+page+download PDF link annotation
    • http://angarakshaksecurity.com/userfiles/file/vitojoxiwakedixojaf.pdfIn PDF document text
    • https://cristalensi.com/public/File/42520929924.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/daa89db06163cbb7dc4acaf5c721c04f/rolepiverog.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/xagesarasafikazitenomaku.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6247002a---57955140323.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ukq8kbjcfnjssqsqj5ne0g1a4/12744964113.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d8050614dd5a833d730b866280956aa5/45169043525.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/kotokus.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc96945acb---15175886223.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/hd7dscevg3g6oq7fkegfbqquqn/lugidazed.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd59ff78bd245836295c6d95450bfd0e/mafajix.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/javafufetixafipim.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e542271e2---wusoxus.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/0d19b1234dfb0a55c730579230d3968e/kositebepabulavotewobonir.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9bsq78bn40sgdr9f8078stgkf7/xukepekotuwamujalozubiju.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/jajasividenoxi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/55023255421e6965c475dde9999fc18b/pejode.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1622269102.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b39b87d75---tivosiw.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/8069200184.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/9044f41ad5778802e284ad31f36aceef/13891672323.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210520231349149.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9521a6e525---16226444643.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5q6q8ni426v0jplo5f731lseh5/fogetikomefotisafota.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_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 17004 bytes
SHA-256: 1926f65f2f14db3926269cdf2aa5ba06c55a25a869e4ba428f2caeff3187bd28
font_01_sfnt_off00013458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13458 10732 bytes
SHA-256: 10f56e206a1f2b618bd1c5fd562b2c1213eb94351e696f25cd70467a61719c61
font_02_sfnt_off00014ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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