Malicious PDF — malware analysis report

Static analysis result for SHA-256 529f390d8b8a18cb…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 02:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 972e4a5dd3b9e1207f5498b3d08f70e3 SHA-1: 15ab16b90c9ce19089df9dbf456a2d81411125be SHA-256: 529f390d8b8a18cbdf0ce2dba5a1501bb84c45c970935d2b424c64d3d2a0dd21
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/260bb2b822dc2df5d8aa1be475e464a8/73174355777.pdf In PDF document text
    • http://ktcz.eu/files/files/6489430171.pdfIn PDF document text
    • http://houselandia.ru/files/53997013769.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/bamepese.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb948b2b59---vopimekizomikixa.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/pufimilabovejan.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a17adf57019---bujeluwuvopix.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/184fff5bc33a0a4cd2f72957f19a2f9c/89499640485.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/30651419744.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/bopozitejadasekivafemu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/juwazimizovisixifijitas.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/51095934374.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/48b6bf71e8d51b1025aadec4100a8762/43140986621.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/zakiwitomexogeb.pdfIn PDF document text
    • https://oliogalanis.com/file/98742896492.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/3o571n53ntgsejlcilbsc3erac/pilowowezoxal.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3r9gdqglngj52kj6as6ssnrrf0/gurizufikuvuzadamaxeju.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/zokufefamalonorumokejunu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/2b39e9de62cbd697a69f113aa6f9008b/rukanokuwuxudamatenogim.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/mizokevak.pdfIn PDF document text
    • https://airbays.com/userfiles/file/babodowedewati.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c97679d02d---76488761795.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdbb1264f8---didijepelibewadasiniv.pdfIn PDF document text
    • http://njxinbell.com/upload/files/zuvizax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=gandhi+experiments+with+truth+pdfPDF 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_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 18472 bytes
SHA-256: 0a4b8a074ae936b17f0ca1402d5dd0eaf7ade6fb41b3290fa941633d75263927
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 10924 bytes
SHA-256: 6da623d2d2c2979d2174d8e961550d0a1311f98dd565c85565c04faad75ba9e4
font_02_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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