Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee3f276fd53474de…

MALICIOUS

PDF

101.1 KB Created: 2021-09-12 02:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d0905bf7b03e0b08c027fb1ff835968 SHA-1: 7ee506e75feb6f6cdd812aebdbec2bbdfe9f25c0 SHA-256: ee3f276fd53474dec9cf7b3bd517062ca5b660a2c68a20871307e5acc9be0c5c
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These elements suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://m-astar.com/UserFiles/files/33288980610.pdf In PDF document text
    • http://linza-market.ru/upload/files/25839936854.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/mebadulujegozegipid.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/72187159430.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/ponamexufeno.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613099037985d---xuzukizadokur.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/40af00c9193879f820d16f874ada9217/84898371127.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133adb020937---34528377241.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da0b246c5---47526518253.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/84295534038.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/35409688071.pdfIn PDF document text
    • http://coffee33.ru/archive/file/94194759555.pdfIn PDF document text
    • https://mediaskills.rs/files/wubososafavurupiwataso.pdfIn PDF document text
    • http://jawarakreasi.com/file/nodokovakugegupuvoxuwo.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/86855520184.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/72957135297.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/weraxifeworunejekido.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/rodusanured.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/baguvazezawebukuxudowofos.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4b2ddd37---20706605379.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/75295182474.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0e1807dc---4750463962.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/kuromoxonirawojus.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/bitoruzolor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=status+bar+figmaPDF link annotation
    • 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_off0001229e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB5 10468 bytes
SHA-256: f564261444f841163c229aa63c88fd0ef20e03f5688ad8688be2d053d1520f80
font_02_sfnt_off0001527c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527C 20216 bytes
SHA-256: ab44e85b828a47d9a6dad1c3e92b79fcd0edcf23fda543937f1842a1f244b66f

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