Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87b16340af61d77…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 13:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b38ec5b2f907d3e2a96ae83029007c74 SHA-1: fc8402233aac556401cd8e0b92a61755a98ef7a6 SHA-256: a87b16340af61d77f6a460c37bb33496d76b5800089faa99550ac9ed574ad0eb
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to potentially malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ketchas.ru/uplcv?utm_term=new+orleans+saints+trivia+questions+and+answers PDF link annotation
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607991823711c---73433421308.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc8d9f181e---kutusidanek.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9660c1dcc---zusozebifarizexodupumuned.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/mamodirulix.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/jexisetilomejitiwomutado.pdfIn PDF document text
    • http://navigator-33.ru/media/file/bevakosubapol.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c7fbf699a611ac369a97e122681a653f/18170913844.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/d2b87be1483d5b12e55f052b7094bf82/68953410453.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b6bb8f7e0---gidafusimopijakuzu.pdfIn PDF document text
    • https://telenovella-bg.com/files/vinejuxekakorazadap.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r1rjj69s9prek8qh0ccbh9trv4/dubibaxopozuwisututa.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc109271a---22669649515.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2ca98d8137---47924425224.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082ed4bf3137---27678382060.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/32490107166.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vivafarafupexite.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/63866874d2ce7ebabb47071eff0314bc/pupukesut.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2baedec7bc---manojetovubovagojurelaror.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/s586ilviu80jqjeu15u3p2gq2k/sogujoxaxasilex.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/nezapogufutabo.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609641c803286---49052292361.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/78628164994.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0d49b1af---bexumasofofu.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/908e54162518fb1a35335c0b45227dac/vitonifeganususifixeba.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_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 17596 bytes
SHA-256: 29445529eaf9af247ed2342f71a17296638bc64957193a5f21b3c23d7e3df557
font_01_sfnt_off0001233d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233D 10616 bytes
SHA-256: 26d4672e3feb45c621596a979643db0821004e9a1e2b9c7212ed6e70e28839fd
font_02_sfnt_off00013b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1