Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19b8301b04b0f48…

MALICIOUS

PDF

74.4 KB Created: 2021-09-27 19:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a7d8140472e5de6df68b9be3f544889 SHA-1: 341bbb3b31b146c6f8fe044bea914ce6a9178c8f SHA-256: d19b8301b04b0f48443a2edea2f79d67ff365871934ef275754e81e5ce8a136f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm used for phishing or malware distribution. The presence of a `utm_term` parameter in one of the URLs further supports a phishing or SEO manipulation motive.

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://ketchas.ru/uplcv?utm_term=professional+recording+studio+software+free+download+for+android PDF link annotation
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139060998893---nezidarabaf.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/9311668351.pdfIn PDF document text
    • https://chingchia.com/uploads/files/202109191011322971.pdfIn PDF document text
    • http://hidropro.hu/upload/tokoroxugi.pdfIn PDF document text
    • http://qwerty.pl/_data/file/72910032733.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/zexegirituvukojukaziwu.pdfIn PDF document text
    • https://superpart.com/files/34678588171.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/35021743741.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/1408998602.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wafixerolon.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/96886115951.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/13149748676.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/38190348728.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/tizabipixifulotexizuva.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb2b97b57---ronafigagedopefujaramekoz.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xaruvu.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/lakiwaxiretolizonopili.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea7cd30ea---70700594951.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/17839210414.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161327e5587c8c---53800198617.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/b1d90d442f671fe3719b40bd30469155/50351063238.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/15771507024.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/kezeguwakewegiretif.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/54281683345.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/g1fvjj3len2ofc4coiqvsibuc2/40814201005.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/pibenibagevurelogomal.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_off0000b9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C4 18036 bytes
SHA-256: 50fb2da85cc8e1b1936b334f3f64b1cc2d849fe429a417e7202e7a923e746580
font_01_sfnt_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10044 10840 bytes
SHA-256: 049078a7aa918dca7a6e607c8af4ff9032f3b02e760bc7369d3df9c792b10c1a