Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c81427ae68b06d…

MALICIOUS

PDF

77.7 KB Created: 2021-09-03 20:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e3f3b9372a533edd3553034baf43923 SHA-1: 1436c10233fff5b3439f93b3c7fc56eadc85453c SHA-256: 24c81427ae68b06df1334255820109193e94ba485cb17b4ccc98e2bb6e350930
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous links pointing to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/fezukadavazapane.pdf In PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/gobokalonevagilub.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e358c5a69---6916985396.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16096924548750---xoxokepemile.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c24390cb1---valafudelawapaxop.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/74691284981.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/rigimosox.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dd6d591bb058bbee6d2ca0b24d48dee5/82730526334.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/66144389003.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/xigegiwev.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e6676cbf9---55422610258.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5f27c3343---76085580425.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071310521714.pdfIn PDF document text
    • https://hoavily.com/uploads/files/18062498061.pdfIn PDF document text
    • http://slsnn.ru/content/file/gewuzexosedasa.pdfIn PDF document text
    • http://unityproductions.com/upload/files/xagoveluxuxoreg.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/70514535877.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/qaa6pvmrlqhc4sc448q1f5gc87/97410729551.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/kixol.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109010853001800.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/pabepivewirexujaxozex.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/dodujafoteroxosito.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5799166568bc387527c5235219fab9e3/tavogiwazatupivomamupeteb.pdfIn PDF document text
    • http://farashimirooz.com/files/besugujoniju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=toyota+corolla+manual+door+lock+repairPDF 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_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F9 10776 bytes
SHA-256: 3d0307628f485c68b4d397e254aaae65cc3a0f065d1a279748ba44d7c5d5bfe5
font_02_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 17264 bytes
SHA-256: 10b584a6809ecd1e25c10aff79d8faa6a51d825b0f2a40c48a077b9225166fa8

Open this report in the interactive analyzer, or submit your own file for analysis.