Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e504a71e6e4180d…

MALICIOUS

PDF

93.3 KB Created: 2021-09-04 18:03:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 45d77de8f7f389f84cf0a1aabf2f4dff SHA-1: bd7ff16fcce4397a452145f00fc60a4302a100cd SHA-256: 4e504a71e6e4180d3c4c6bf5a51ff3d7ddc742477557293d162419a25c32155e
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains a link farm pointing to multiple websites, some hosted on compromised WordPress installations, likely intended to phish users or deliver further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure interpretation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://irlanc.ru/uplcv?utm_term=how+to+make+pdf+file+smaller+acrobat+2017 PDF link annotation
    • https://travelstore.tn/userfiles/file/41624214784.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d6e8d11229bbe05c23a8c40832ddc2c7/towubariwodafi.pdfIn PDF document text
    • http://sdds.be/userfiles/file/19212228371.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac174b7c3db---53548552398.pdfIn PDF document text
    • http://hongquangled.com/upload/files/19828222265.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/7c6gp1qivo8bn15ga7vkmpfsgg/15594149613.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/65916246004.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gedujesapiza.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870eafec6ac---basofifabomedobega.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/fegef.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/c406d0fc6cd74f133f280c1c38467da8/79239362314.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608067c800d3d---murawu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/vebeluvamun.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44020343171.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/87306242532.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f4563b0a---36326527315.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/cp5bqetakt5j8j4hmhk0n2e71f/pawono.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216301312359485.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o3sutjjkjgjkluah46o9nfb9l7/fobazogopusodefu.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/58514296250.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610f77463e5fb---fuzugaxuligu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bff5b7eda---xekixafibejev.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaf580635d---37149667466.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a98e41e2506060dd542aaae54b4e593/94061217022.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/1bcvms44utd53kn3hfs54sajp5/pajuvegasegetelenam.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/363d7e609084ee105bd3ea2599c73dcf/pegawuduvidorutibewajezul.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_off00010738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 17488 bytes
SHA-256: 5b7e6acf5477f4ef92364fb23c421ac1ab7919f5d4b47c414b8e51a03735bcf3
font_01_sfnt_off00013465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 11328 bytes
SHA-256: d88017b3190ff6b7ddffceb16e59f8fbb2505f0ce316c15db562af48324fa9a9
font_02_sfnt_off00014ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1