Malicious PDF — malware analysis report

Static analysis result for SHA-256 300724e739aa76b7…

MALICIOUS

PDF

95.7 KB Created: 2021-08-06 12:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 550b2e1837c981bf2f91d4610de7daa0 SHA-1: 426605923c965d6b68c6ac88a7e1370d0d3731fd SHA-256: 300724e739aa76b7efd3a0904f0a4cb73e106ce2db4c183275e481bc344f0c6a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tamil+hd+dubbed+movies+1080p+bluray+free+download PDF link annotation
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43726c5839---gudijamalukimewolavinig.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/dubovevugijalulubotejot.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/91437486785.pdfIn PDF document text
    • http://zechnerbau.at/images/content/files/20858817117.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/51557148811.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/demurekevizituduzamaju.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/718100582081620681821.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/tajexaxovesasujuxanizimuk.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/tc1dhubndi89atb3h6bnnpm9p1/zapulevukexe.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/26321860265.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/75365472347.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160796e7f5b1a8---vajunomimaxito.pdfIn PDF document text
    • http://4bx.pl/public/file/53158843860.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e11e1ff631e3124a1495d6ae645584c2/75944241622.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160847dc0a0424---lafalagikazavajipif.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/livomosofaxaberoresitamuv.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5ac1f2472d062bdf6053a13c9d5b4e47/mitasexisul.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/37caf4451b083d8a763601cd142db9d2/71156306510.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f7fd78d3---60577824461.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93a214718a---21270329048.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/gegixififofuwu.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/92992455580.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/zokaxa.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b05eb31085---29833409585.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/82526293164.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 18088 bytes
SHA-256: d9c1843def87e8b6bbe96caee80bbcada38f896c9ad81ccce3fca884575a9f41
font_01_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E67 11516 bytes
SHA-256: 21fc37e3b6e8484f037d0fdea32ac5356b717bea273785c8ab49aaa6a4fbafdb
font_03_sfnt_off00015948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15948 16252 bytes
SHA-256: 2e8ae4fceb56a0bead41bae6fe57e3463e41471e76938d8d8a588b70a63e50f3