Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1598cebdfaddd5…

MALICIOUS

PDF

166.1 KB Created: 2021-06-23 12:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f1867d56a53e3788fbd4352e2223ef89 SHA-1: 962c6a10186ebfb17c59c46ea0b3aa019e2ed1fd SHA-256: ca1598cebdfaddd5d2cb33f86c95b075cd84a215f8d17ef47e3d87ac60ea7a25
204 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to distribute malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9732

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crysiq.ru/uplcv?utm_term=chandamama+magazine+marathi+pdf PDF link annotation
    • http://baaningdoi.com/file_media/file_image/file/zutakegolidarorer.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080a808a0ff9---tapurazumewakanufigokeron.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ff5726be6---76837662619.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/75137704838.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/fc30497377d91480f85d359d8e1a34f9/46346265172.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/daa452b9910b8561cc13f94af7672a55/76472303213.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/11647333493.pdfIn PDF document text
    • http://saptpadi.com/files/file/fugetor.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/89d806b9b3bfa086a2289e11190a983d/timeloduguta.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04b0e0edd---52170025655.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/sjircf3mn0uqfd5d43tbt0h82f/fawegad.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/2820c1014dbe234296de834a1371a55a/ralebajevireluw.pdfIn PDF document text
    • https://somogyplusz.hu/files/tusoze.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bc40c9d5c---zugasav.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2f9c4a875---76602342570.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bffb15595---paxakolukisumuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cdc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDC1 6444 bytes
SHA-256: 96ff8b6616e060bcec5cb64e2abc42fcc22926e9863bdf3a870cc16ddd78177d
font_01_sfnt_off0001dd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD87 11216 bytes
SHA-256: db26c4fddff7bf3df578f6d49c9f2a792b39a05da5a732d2d492447a4c7cfc3b
font_02_sfnt_off000202fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202FE 5200 bytes
SHA-256: 315255eb693e6046b1e29e033d6b2b168f372f1d470053273ed8931416c79efe
font_03_sfnt_off00021489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21489 22568 bytes
SHA-256: 06ed747fb9474fbc46e409c2dac6bed6a6bf798a4635c4c4cca6f02ab14784cf
font_04_sfnt_off000254c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254C3 18856 bytes
SHA-256: fc7e1b59ebb08d206ebcf4ad5a63033d45c26d378be48aeec8eaefda57a18e7d
font_05_sfnt_off000273fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x273FB 5988 bytes
SHA-256: 30d6af99282aa1e40167297ce2ff1aa4e5fb0eb16dbc5718244119496f26ec06

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