Malicious PDF — malware analysis report

Static analysis result for SHA-256 f73252c4c084bded…

MALICIOUS

PDF

86.4 KB Created: 2021-09-03 05:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b80b1da2b89c471f73f1ad17f18d41cb SHA-1: 857437000588282e1a1b217a91250022137933f8 SHA-256: f73252c4c084bdedf1a23a0defca0e899d7ab9f052e18abf7d7d5e2b335af0b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. No scripts were extracted, but the structure suggests an attempt to disguise malicious links within a seemingly legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddef1107fc---dofumifetiwonotuxazokusin.pdf In PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082109eb8e29---xupomesaminimazo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd53090070---juxumizilidulawa.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/11923340604.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/10307520364.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/fudixapoz.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/844daa2a97c3525f0bfb57cd05f9da61/35725489610.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/e421811681da94d952978bd04d92be45/tediwaxatisisokeja.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/vkc2l5djd9t5t2mpm0c10ruih1/vojadewetatebulebaxezeji.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb772ea912---vanoki.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/31957155215.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/fatul.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a66520180f3d1a69d0ba48f11e5e86dd/80539339427.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/xinuzubetabizapebo.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/032319da9cb601c9d8f2a1bd4a96028f/21110561560.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b348e164e6f---lejajewuxude.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdfaf0f249---vazadaj.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c88947ee7f---ledosasukekil.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e19b61f1a---85821955371.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2902c1553---sunewojasexodezufikamaz.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/zavapota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tabla+de+conversion+de+unidades+fisica+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e63a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE63A 17204 bytes
SHA-256: 79c2aa3c2486ee87845d756e332868e1a2ce70dec24a50e1442da581d1dc84ef
font_00_sfnt_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10002 10784 bytes
SHA-256: 5a05f6ff14cfa1e3b82274ab691b18ce6481269e0ebeb65e1a78a021ae830ccb
font_03_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 19752 bytes
SHA-256: e7f1447aa1032d5dde2011e245876495f5ab5d1ef77648758dbba4c85211862d

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