Malicious PDF — malware analysis report

Static analysis result for SHA-256 244babf4bae4d171…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 07:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6fe4521b7099d8501933ea8742835d96 SHA-1: 7578a12e5adabfb48891acb1e717c266116bcfd8 SHA-256: 244babf4bae4d171d10481ecf3ee736f80a09c8842ae8e469aac1e702aab966a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that function as a link farm, directing users to external websites. Several of these URLs point to compromised CMS upload directories, indicating a potential distribution point for malicious content or phishing lures. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://oniceh.ru/uplcv?utm_term=how+do+i+factory+reset+my+android+phone PDF link annotation
    • http://gojjang.com/uploads/files/wukagegebukazabot.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/3cc3a3478280cc631990d2c39079cc49/dewuj.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sivuzexuxemujerefabak.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614297d2b4d91---wawugodokomapatosewu.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-16/20210916221415309419.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/kevipolobuji.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/86980172208.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/mexinerujorad.pdfIn PDF document text
    • https://renteci.com/imagens/file/91919939675.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/viduruzigozifavegoriwanog.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/3906016412.pdfIn PDF document text
    • http://reafamily.lt/ckfinder/userfiles/files/46019739548.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/22418848419.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/lebarufajudugu.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/32949106432.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7fc436674f594ba8959a05bf3aa39537/zapitisuxilugogitanovixe.pdfIn PDF document text
    • http://kdekdyjak.cz/data/rufulefuwejunamixaru.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/giboju.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/gazuvumaduvul.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/88906417627.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/50178983480.pdfIn PDF document text
    • http://szwygs.com/upload/25595558440.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/71880224262.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20084c0b8---30104969920.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b50e70ca6---50632972444.pdfIn PDF document text
    • http://limoride.net/gallery/file/jazelipoxoranilamo.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_off0000b347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 16444 bytes
SHA-256: d36d8df7dfe88e67a50191e01ee7dd24a984d298ad0bacb5cb686dd4c20b171b
font_01_sfnt_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 11028 bytes
SHA-256: 876f661132349b21a0e97317ce99301d1a047f57e28d7c5ef04ed4e0421c0372
font_02_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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