Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb983bda547780d8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 02:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 506507075f9f3dd14df1b2df64c99fbf SHA-1: d3ab630298483a2ffabd2b8d2ecc6ce10f6e75fe SHA-256: fb983bda547780d8e42b8dc7f89e333cc8283fa89524f9f286ab91e3e29de66a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress upload directories. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://tlproduct.com/userfiles/file/dikulifasavegitilafifiwo.pdf In PDF document text
    • http://edumedcare.pl/upload/files/36513171074.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/343465279.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/tunumekomonemolisokib.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1611a173114016---14927488130.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/90b970b56d6a4652b23c88884648bcb4/xunolarozi.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/dovodekijobegosi.pdfIn PDF document text
    • https://kede.org/userfiles/file/23466129717.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/polanesepojelodovaxurege.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/59701557206.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1fb1cf74---siwukotisaxufekuvoneranep.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6bce8b2329---renesowe.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ckofdpd69h285itlfeoc65gpc5/buzobalosojubuxo.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/59889808518.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/vuvovugolo.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfcf4cf6a7---wawovubemunugowuduxax.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/1544fb23e4d8098de6c11cd8ff4809f0/futupa.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd728a1548a---7452107861.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/gusisaw.pdfIn PDF document text
    • https://baptistfriends.org/media/vomugogutuxejajul.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/kc36ued1f4riu01rs58nt0jg9t/timivenel.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e59c4e8b9258bb0affd74dab2e3a9ef0/jivorotibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=about+triller+appPDF 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_off0000e4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CD 18228 bytes
SHA-256: 40a90dac1fd29f15b5a92eab2284be46d426b084c21c3adabe569343d8cc3594
font_01_sfnt_off00011421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C38 10192 bytes
SHA-256: ce2dff8565dc5bd036a90c5347fd3269d5cb547524e458ed8ebef188e9e7b238

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