Malicious PDF — malware analysis report

Static analysis result for SHA-256 527730571696023d…

MALICIOUS

PDF

92.3 KB Created: 2021-08-13 05:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c77af65755532a4db41beb1f03c2869 SHA-1: 8da4757bd5d4cd95687d3840714d08d08fc6d919 SHA-256: 527730571696023ddb0091a62e6f858304ec220b36f5646d9f94971013e7c882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=what+are+the+4+sectors+of+hospitality+industry PDF link annotation
    • https://weilaimachinery.com/userfiles/files/midot.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/54978806828.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076289ec0d91---90030800407.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/1792832246.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/940eee9aba74b9c5adef064016554fa2/fematimejuk.pdfIn PDF document text
    • https://bselink.com/userfiles/file/sodirapawise.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ae5pa8fkmpcrqhtef5lo6hlee5/86533553729.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/76956499474.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/76234766936.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/61607941730.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d596f9a7a5---siranuwibo.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc44878b00---63283228966.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aec6ae8bea---lizesemesafiraxigipibor.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/11889456155.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/6586303240.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/fudizapapubivurikutozud.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8eaa34ff7463a9c379113a60a1cf87fb/legarelanuzo.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/84711051431.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/117c2f193a3b853741bd85ebeb47aabc/waxodukosidi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f265832ee16---98815022539.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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 11004 bytes
SHA-256: df5aa11f7e995bc9eb4ec26393badc9edbc9aaa81eac3a85b70abc701b49f2b2
font_01_sfnt_off00011c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6D 17548 bytes
SHA-256: a6bb4bac5634c34fdcfacd3266b5933618607959469453731e08bfc8b5a03eb3
font_02_sfnt_off00014a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1