Malicious PDF — malware analysis report

Static analysis result for SHA-256 5216146c18b84843…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 13:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 12995b30eddbb6d097af518ea685625c SHA-1: 5b538aa2c5f1f971a0bf89326762cdd24e114135 SHA-256: 5216146c18b848438d980bb14426a98ccf100a847e1ee472e7f5bccc572bb160
184 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/b029371djr2csvr09vs2n67a19/tuselajekuliviloxasadepo.pdf In PDF document text
    • https://cristalensi.com/public/File/niragup.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/30030378859.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/9115sf15vr404ae10l41gm7kj1/manel.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/sidivi.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/2439694486.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d846f41768---54950987593.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/rafavin.pdfIn PDF document text
    • https://brakos.it/file/83666491138.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5348fd79---selofogaz.pdfPDF link annotation
    • https://ehotelgateway.com/bot/ckfinder/uf/files/mabipubesap.pdfIn PDF document text
    • https://kopari.hu/files/file/73476916457.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e06522a4637f5e69c09458b3cd912441/zaxubafige.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/6536428374.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/36464358759.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/luvatekanagiw.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/a3c07ad1805a508ccacd32693f5f914a/84711223780.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/686f7e27ee69c8f0394d52855ef9b3fd/2841301132.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/8148796312.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/59593605026.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a61715b0d22---dexojevelijuxawuwenaf.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/44840300601.pdfIn PDF document text
    • https://magerp.org/upload/files/92675032578.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16103046ae9277---33554952571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=reproducible+student+worksheet+the+alchemist+answer+keyPDF 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_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 11356 bytes
SHA-256: 87dd7e0eb1b2d60a5f1eb684ca1999a0f0dd793dfe7fb403f20f865a28db30bd
font_01_sfnt_off0000fc75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11487 17128 bytes
SHA-256: f95869c0b158607940ddf1fdc65a46b05b5ab590845ebeb4494e46649b4b3630