Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32a1acce4d688e5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 08:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9f7eb456286226ad0867bab9c6550af6 SHA-1: 8742b5c18fb0aab202a01fbfba5f147c2c5a2dc9 SHA-256: c32a1acce4d688e51b39f26704f435b2816c3c1b8a5e9e12c0f7baab2d68b2d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of multiple external URIs and link farms indicates a strong intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://photo-preiss.com/upload_files/files/5712565097.pdf In PDF document text
    • http://mtsskzy.com/userfiles/file/joketirujodaga.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/11d1854fd33d9ffc93d7e26187d954d2/subidepojitojufajo.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/geduvibe.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/nanep.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/44914302633.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611adde3adb63---wusamete.pdfIn PDF document text
    • http://email-database.info/userfiles/file/kalofoxesuzipor.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b145a1668a504b4fefef335ca2b9087c/vemuwufofogima.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vg47v1i4adr4j5jhalur8ltlj7/88285195947.pdfIn PDF document text
    • https://izr.fr/files/82878964966.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/74886392292.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/30380367295.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/35053392287.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/88518718840.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160761138af568---sanogegijabup.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/virarilaxox.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/31212827706.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607200ced9375---daxugebetosifutopudoxe.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/99848527527.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/98774938662.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/20642365907.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/035cb86d1e51c25eb18a325dcb978b25/61523428615.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/gejodobiwerozaporal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+see+others+snaps+on+snapchatPDF 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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 10412 bytes
SHA-256: 7162ea390c3530d41d02b956067ac2401cde3e79652c0511a06edbad4b0d8279
font_02_sfnt_off00010472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 18488 bytes
SHA-256: 1e1a5eb0cae576141e1cca75d5a7038acdffb6162dde5f4f85ea7766b602530c

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