Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a4220717e91499…

MALICIOUS

PDF

94.3 KB Created: 2021-07-03 05:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 962f6a6d588d55e3120d079ef1661fe4 SHA-1: ad9b6b71ae7dfc0e7b39b10c3165ab5dbef8fe06 SHA-256: 02a4220717e91499b0d71b216db015d5262963ff1a681b1b8297cb5d4e8940d1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting file upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs clearly show a pattern of hosting malicious content on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8k60025hmk1ahvjh3cmk448nr7/10887858805.pdf In PDF document text
    • http://colafranceschi.it/userfiles/files/88893309555.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/94230150298.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a92667b21da---rusugifukunina.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8f0b89f2dea7a87ac585d8fb8bf2cd45/10924775640.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bikowizatuwetowezaxedabo.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/34526134661.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/rulubopizuserazunubotuli.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5386af2e6e---98512717556.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2adb567bc0---31121979149.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/ziraxepemuvejevazob.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6454e85b6f---xanezadotexixiselebumega.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/zetibixifubapaboxopuk.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/lajudexubekopetuvixo.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/3743d78fb4adc3407a9619986db4b477/47255743280.pdfIn PDF document text
    • http://www.proyecpapel.es/ckfinder/userfiles/files/kisaronivotenabi.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/rizoxevonuwewa.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/18c050efb2a5eee5b2651f554f2df1d9/13662632398.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e5d78126c3f83929c72bba4791afb52b/nadatumejelowabedisanunub.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mmei675185va8anovli6l3cocv/pidomi.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/tiwizaravidatosimidasig.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/15812942087.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/6697092384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=consequently+is+what+type+of+conjunctionPDF 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_off0000f3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B6 17604 bytes
SHA-256: f3ac9d9c17b6e67e215ef5e03a4a049022b230b0e388cccf021ad4c6c928fdf8
font_01_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8F 11084 bytes
SHA-256: ef61e066d882dda1bd90997eba662c7f273c39143111719e540b352a013c35c0

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