Malicious PDF — malware analysis report

Static analysis result for SHA-256 154c38d7a287a0bd…

MALICIOUS

PDF

91.6 KB Created: 2021-07-05 23:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25b18507f6cc77617ffe5134c3349cfc SHA-1: 961e1edbee6bd295e3a784ab2255c2f23601e934 SHA-256: 154c38d7a287a0bda7d26cea93ee1797be71531c42be38f5fddd2d26458905fd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The document body is unreadable, but the heuristics and URLs point to a pattern of directing users to potentially malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5f4516f6c---67503262284.pdf In PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/96080546086.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16079816e36a3d---63269561249.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/rovikerujukasurarux.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd4fe3f8f1d78f11252e6a9ea7c1188a/54812106815.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/47025494841.pdfIn PDF document text
    • http://jedwines.com/cmsCart//upload/file/durisebejopebobireb.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/68237333cee8673b782dca55c8863a8a/basivena.pdfIn PDF document text
    • https://ikansambel.com/contents//files/kuwemomowusuwige.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd55cb5da82---wujilesasu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079272e4611e---nixazunul.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f7782b59---zogit.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6059ddbb---91929146884.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/d763a91ba68cd591561d19e2cbcbe9a3/69599967584.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48d56a4594---kufinuvemusobo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/1b26e8f5ada746cb75fb3591b3c49132/jupigewezebizagomojejife.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/wigutesometogaromawonu.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7723062129.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/zujevipepopagegazatipa.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/9910821994.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/23454841560.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/43d2d2e1539ff3284920b5beb15742c2/kamolumikav.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/kukebipamilezivote.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/4c276244db71f409ade72c2301c9fb12/4662064849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=code+gta+liberty+city+stories+psp+helicopterPDF 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_off0000e8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BA 10976 bytes
SHA-256: 845597951f103236cba6a5b473404d90f6e2a1759cbe790ee3fe46f87aeba852
font_01_sfnt_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 16084 bytes
SHA-256: d11bfa2b02c462a3f9075532ce7ec1132ca3691ccd6a850e0dcf0119a218c04c
font_02_sfnt_off00011724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11724 19756 bytes
SHA-256: 323193acdc62fdb1f0ca9a07202e3cd48c2cf305db29375639d8d564f8583b14
font_03_sfnt_off00014858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1