Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29e95657f04ba7d…

MALICIOUS

PDF

90.3 KB Created: 2021-07-14 10:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41281e0b4e07fc252599e34abaa1c538 SHA-1: 03f0ea2b417b0007e6f9d487c32b211a0ae75bfb SHA-256: a29e95657f04ba7dd701c34b9c62901b1a28f16f59a3e92880ad7b8745cb7948
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document is designed to leverage these compromised sites, potentially for SEO manipulation or to distribute further malware. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 5

  • 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://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/d3o91fan9k1ltrqfet4r455eib/zamixiratujasemurilinenum.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d3bdfd8a8a932b723d1f63a316a8b940/34654657314.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67edeb743---88368505005.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/pv1cl9ifipdeh3co7bekon2dks/reteludulez.pdfIn PDF document text
    • https://people11people.gr/uploads/File/xagawawixipitivudugigazid.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c9c98bea---87473222192.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0e946947e82e95ebe8f401d2fadf3118/fukamuwemupuzeda.pdfIn PDF document text
    • https://triosms.com/userfiles/file/71714906564.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/nitorokuwitopakuwopusu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/sabebet.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607eef53f1326---48564632400.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/e96f400mdknh8fv582p74mm7oe/laxizav.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/mivepuv.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/kefenilimajadoko.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082eedaa1c0e---48214032995.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/20037206454.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/9882999741.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/1039d78f7a2875cb161b37dccfa30cb7/pemotefepavowodapufoneniw.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210523054756.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/sawopen.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e60c77b570c---60151738330.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///nadavuv.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5944ee356---soluxotebego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=high+priestess+witchPDF 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_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 10296 bytes
SHA-256: f9a5a999592d9530dcb198fc634d9b9c3a8af5285a77995f8cc1826cd8e20ad5
font_01_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 17996 bytes
SHA-256: d89e4a7454567c2e636db0b0d5a16cfe630cacb27516e90c7758bce0db5a24d0