Malicious PDF — malware analysis report

Static analysis result for SHA-256 9773823dcad4b96d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 22:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5ceb2ead5e88b0c97cf8caf3266c0c05 SHA-1: d39094634b171a99917d721e5fae45372a3f269c SHA-256: 9773823dcad4b96d8c9f444726c5c1b3968dcc59f3e8879b26a63ca4cf124b71
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories on various hosts. These links likely lead to further malicious documents or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/d9754545282e85925966e345d408ab55/bowolizox.pdf In PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/10909807200.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xilalifeluvatejar.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/52b9b3c642990afab2378a59991d5e0b/jokowozorirefopuw.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811517ed009---62647908798.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/fefiluzakunosume.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4795539fb9---93418920737.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/e06d71af1fcca1fc4d7f8f7e1db43b76/39352586948.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/d2d14d868d4bda77ae41f80b801fc4b5/mibutus.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/28367326868.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/vowikisesimulefugadu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/nolerasaj.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/jixivezofataxevaj.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/disevovopelirotilevera.pdfIn PDF document text
    • http://kesifveotesi.com/files/22219317363.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/411084a34185cfe2d4e94dce882ea70f/296291890.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/52191236551.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/3984584038.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b779c7b3---dujitiviriz.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ad880b44---80017743712.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/d8d24801d15561b17b0bb4218c19154b/ginagi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/9bcde034d56047a5da56e585c2ff683e/kivorekimatojisonu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ece8c9ffcf---48599515157.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/37171057673.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1e4ba5a0067d9a6fbe838c809b4b14fb/4035629142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=arquitectura+urbanismo+y+dise%C3%B1o+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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 19000 bytes
SHA-256: c91f0c6670025abcf5329f32b66645a6385f90241c67a886d60fc41294b1e7c0
font_01_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 11420 bytes
SHA-256: 076e4b1a684b4bc9cf7053793a134a680eb84a76e7046a0ab7a7da459f16b2e5
font_02_sfnt_off00011647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1