Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc13ac1bb477b26f…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 22:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6f06e42b7abc3d99a27c2d1fea07f48 SHA-1: 7b663186c702838b452ae0e636c715e7808b8fb3 SHA-256: fc13ac1bb477b26f8dde38a463421a3ad130936da90578083abfcec97b2bf2d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, likely exploiting PDF vulnerabilities to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=velocity+vs+speed+worksheet PDF link annotation
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16113843f9f90d---nujazagakorora.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/04dn5ft80ob5i3s6hhvdbgte6j/saborikijonubopu.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/nemukuvuxeked.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/39990636191.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/316cfb71c4794df346bb33cc90d48f97/linatajexojebu.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3c344559d17f73f0c360dedcc846c2dd/89234342556.pdfIn PDF document text
    • http://caramelitos.sk/files/juboxexizuradeg.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/29836512294.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/100cc3bd57ebe21fffa6b162ccb64e5b/78554486674.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/32438278441.pdfIn PDF document text
    • https://ultralloy.net/upload/files/32975919917.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a9de72ebc---54484205699.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/nafibunazalulu.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6fipnb9m0bo1mtoupsa5j8l873/80651292812.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c63c8851b91---kojarixijogu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc73a880a---40303080164.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/4350f6053eb8012bbc8f2da591d1ef39/reretufatiwanonew.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/4855300638.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/26254255207.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/65370044393.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/93125647243.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ota7330tto7331m41k5eiv1vo5/zusuzupijipowe.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e308907b---govej.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/sexijon.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/kadaboximelobugiluzabu.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_off0000baf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF8 10672 bytes
SHA-256: e9b189ea44e915545163fa087c412e77c8ba5b96219504e3c6c5c2a9b22f212a
font_01_sfnt_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC0 16276 bytes
SHA-256: f93408666091260ba7b8533a17ee59f2b992cbc92b5577222295a1ea43596795