Malicious PDF — malware analysis report

Static analysis result for SHA-256 5706e59108486729…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 18:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e63fa905bd084066939cac5a1333d10 SHA-1: f7e148fb3798311639afb00a44f89a409571a9b7 SHA-256: 5706e591084867291156783cfd77310eac1c65b7c56151655d379925ba4e2dbe
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=sciatic+nerve+pain+exercises+pdf PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/727cc73e495d66069390e793214a3c9d/polat.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48418dacc---wasipodurada.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/q47m09cr0plnsvab2r8t9k5rb2/76832128299.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9fd21bbcd8c0114a8531719ff525c361/zusirivenuvomuxug.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/vefamawodefumugovex.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/88484741877.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609a57a58a838---67806613815.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/92725166107.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f048da06ac---rupugul.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/nodidanobesevilumiti.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/xuwagamefefovuvoruwud.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/1041138174.pdfIn PDF document text
    • http://omg.su/upload/File/14403425227.pdfIn PDF document text
    • http://qdjshg.com/files/file/nejopekuwetodopafexo.pdfIn PDF document text
    • https://coevent.ru/upload/files/kikebubopiwe.pdfIn PDF document text
    • http://honda-vo.com/upload/file/bowuvowusuneporazikusug.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/tupunewage.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47af8bfa02---fijixatusukepeku.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0d8b9e791---sonuzatuloxejinalaja.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/pajeve.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0937505669---4401726671.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/dezoxiwazubituzi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA3 18012 bytes
SHA-256: f76a69112464ba8fe2c1d9d5092f87247e423ba604caa1a11c7ea680d809c3df
font_01_sfnt_off000109a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 10692 bytes
SHA-256: 840f3f16ac7932236c642dbd374c5602c0f52bb3f5d00c39499aea08895404ea

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