Malicious PDF — malware analysis report

Static analysis result for SHA-256 854f0553eb151ee4…

MALICIOUS

PDF

110.9 KB Created: 2021-06-27 11:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0eeb3a4315ac164322952862c44fbc37 SHA-1: 762eb2febd89c6c0b00fcd55bcb1c90932a9db64 SHA-256: 854f0553eb151ee4522a697386960cda529f6ef9456967b0a0a9c6c83d46ce4a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various domains, some of which are hosted on compromised CMS upload storage or appear to be disposable. The primary goal seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

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://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/jevamibixoga.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8941bddd0---rebipepinaligipadubasevox.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ff43853860d23eba3e7ea7d8a13afe3e/jawukunibo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/98bfa9119a65dc1c7d97127394eb6306/43752386864.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/99820205937.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8421ec1e23---rojifetekuwaxowedisajonu.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/zuxakaxoximakem.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0cdd499dfacb1295f865da002606ac88/jitorobiwes.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5fdcb45e5---tinopumotexuz.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087e525128c8---26353533762.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726097bf4dd---jukiromepikime.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd9eabdec9---90660126124.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a836398b0af---wokuduvazuzisan.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3a0207652a7d93b00d73f735a019bd88/kibelejitexiravedejo.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/75254351442.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607735cfb168a---sozupumifuweduxifalex.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/e219ea4b8c17c20cd84f70eb1bd947fe/kuwibegidizerujox.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc96d3539---tuviwosi.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/7988062174.pdfIn PDF document text
    • https://airshow-bg.com/file/jumigixasuvusukovuvejuze.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160749b5db2228---somuwele.pdfIn PDF document text
    • http://short-story.ru/upload/file/xodoruvijo.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/90347870053.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ee1887cd13f1b2d04c0f0a2eeabf594f/jifokizopuwerexika.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/20c2aa81813c7dd8f274cff04bc3ac5b/92348630485.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/65a347a1f5bb649b45e0cb930c41e0fa/sokabewuzukabuloserime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=the+tragedy+of+arthurPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000148f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F7 18124 bytes
SHA-256: fd0f39a6c5ca3a4d488715d968a97823dd63b8364bee0aae17c2bcd30c0e8d2b
font_02_sfnt_off00016590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16590 18012 bytes
SHA-256: 1c5bc893e391ad46005a6deca4c91043eee16021b75010f079f1beeadf0681c9
font_03_sfnt_off000194c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C8 10400 bytes
SHA-256: 55a6178c4a3457b2fa6e1faff481b9eb66f725d9d10b71afb33e548d09cb9a6a

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