Malicious PDF — malware analysis report

Static analysis result for SHA-256 9814711507dfea9c…

MALICIOUS

PDF

85.7 KB Created: 2021-06-12 19:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: efd7c0828650cbabad9da189331f7d0c SHA-1: fcd1585f91fc8f4759a8746306c386dc4baa04b8 SHA-256: 9814711507dfea9cef0d1c9c5e78315b07359dffd06c1e1819175ca3a2fdeb2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised CMS uploads and disposable hosting, likely to lure users into downloading malware or visiting phishing sites. The presence of embedded URLs and the overall structure suggest an attempt to distribute malicious content or redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pistant.ru/uplcv?utm_term=fs+18+apk+download+hack PDF link annotation
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6e645d49cc9e25b0be75d2cf645aea0e/55886575588.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081afc703fe5---kanen.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/34166297303.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/c74d43b1a20c03fe0943270133b23fe2/94316596732.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/84614571925.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607623cf4549f---zipejefejowene.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/kaseravutusifug.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/55792923432.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/05211a3aafe314e4d55265f6fc79071e/62761712464.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d0ce88aca---14298946907.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b64ac4a19e9---54592866340.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/rutuparaxijalaver.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sifafurimixewin.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/mivekajafireludeneni.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/6aa243dc76defb43cc0ab61e9d5eda74/fuvuxuluxuwibiriv.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/88004464586.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/83681114991.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/6521dbdd8dc2a144a2ecd14a45a55d9f/nedob.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aab9c6adb0---dopuxasebotowaxizule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 5420 bytes
SHA-256: 49bae75d2c847065e2adbb3ef153bfc8b2bb22992dc08d919da888d5ade4ffc9
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 11520 bytes
SHA-256: 3bb7e1baed63256f5b286817ca17cf90cee8fd7cdbd82912521196268a4a0019
font_02_sfnt_off000131ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131ED 16404 bytes
SHA-256: b5e1754ed77ed282a4da75f68b1c427813cdc87532745c58c0a434b5fee0c193

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