Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ead6092c4622442…

MALICIOUS

PDF

97.3 KB Created: 2021-09-08 15:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d95f627138320ae48a2dfb112bcb600b SHA-1: a8d72f0a126f5873dbc54b9bae30aed4704c4aa5 SHA-256: 7ead6092c4622442568198e045144eec7b72a2ed0949a69ecf0aa74a20639bfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on potentially compromised websites. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rh-h1tapi-turbo.com/contents/files/96389909698.pdf In PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/61970434558.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/41283101476.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b3254996ffab66dc8249304293ba6a62/turalamumuxa.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613247853de8f---86756890540.pdfIn PDF document text
    • https://khanikango.in/file/libamavipemoliwajowodiw.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/pazozezexafiminofa.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/xudobadofowejimomebisa.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/93163642911.pdfIn PDF document text
    • http://hbaoge.com/upload/files/20102677316.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109061702401734.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/fakitovobu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vpcs2onv8sbap3ocsho12klb33/8160561822.pdfIn PDF document text
    • http://agavietnam.com/img/files/saroganorasajavoxaz.pdfIn PDF document text
    • http://generoussecurity.com/uploads/gazafoles.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383a3b662ee---87937725981.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/16129509319.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/sapopawopanisowidezomakut.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/85267658485.pdfIn PDF document text
    • http://z-him.ru/userfiles/file/farujalowiju.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/vedubusoxiwexubo.pdfIn PDF document text
    • http://irollee.com/userfiles/file/44366777938.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gv66akmquqvep1rhifjgi21l6e/ketoravasotunulokizanub.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/xizajubadivu.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/videj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ketogene+ern%C3%A4hrung+rezepte+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12967 10716 bytes
SHA-256: 77d4c0d866838306bbf48d3387c3efe23e4017f2cedffe7b447b28c5e3107acc
font_02_sfnt_off000141ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AC 20712 bytes
SHA-256: 11a3e0bb85730e239b670095af8ad48f5ef531a6b4e93736946a9bcc32275986

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