Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9175cb17dd2b85…

MALICIOUS

PDF

84.5 KB Created: 2021-07-18 07:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4bef64fdcb129bf4ccd7d47e3fa1ac7f SHA-1: 3f8ba62074b23ef91706cf74347367ecc5c9a8ed SHA-256: ff9175cb17dd2b85cf00aa800a29823fa087278544580cf3f948744b1c6974bc
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate that the PDF is part of a link farm hosted on compromised WordPress sites, likely intended to distribute further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f991a3523---tolijawajalujewamavobafi.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608827cb012f1---zemezipolamojekar.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/64142260400.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a46a6c13912340ca1dbed3638c5fe8ef/42926482400.pdfIn PDF document text
    • http://haphadoor.com/upload/files/nogeb.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/popapipebadugavutobipiku.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/5180438ea8ccf4d4fde0beeaa1dc51dd/lukaxadozagomutoda.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc57e45d17---25287601572.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90b2a4f9e---kalujolo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87cfb96ad---fuvabemedenam.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/dbaf55ce1f2e89e11a10c8b4653f94f2/forulivujesos.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b781d4c7f85---xupenagaxajotalobawa.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b9093a2bf---luxidifijewopuxuvikaji.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/busumas.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8ddac11308fb514fefb8eba0b14d852f/56757654781.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ebobikuzegemobalutujoki.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/wubepibagifoxu.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/jobizavedumukitebovatoro.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/65807262412.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d0a69696a79246580fae773d33c0db6c/mixemi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b384b7be36e---remukasemulul.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/42972348409.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7c804c627fb4cf0d11b34078986e46e7/nisovalofalilowope.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/91112656568.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/rurugekibinurep.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/1174368539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+leopard+storyPDF 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001025a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 16596 bytes
SHA-256: 87fc47a33620b715c8d544114dd71c609e21777c448d23d2afad20285818b3fe
font_02_sfnt_off00012d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1D 10372 bytes
SHA-256: 8f79a42031a129794a4d5e1dc75efc2f4729dd3b537d89e7f94d89325d69bf68

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