Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ad6d18ec6b9c19…

MALICIOUS

PDF

70.6 KB Created: 2021-06-14 02:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: cc021c663ce29e1bef2fa8ea92641fd6 SHA-1: 3bd85ad97bf4389ba442ff54b41d622d7d7e9ceb SHA-256: 47ad6d18ec6b9c196dd4beb4245169a82ee21a0bd15b0bebd30d9ed1425f5310
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised or disposable domains, indicative of a link farm designed to lure victims to malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple link farm heuristics supports this assessment. The document's content appears to be obfuscated or corrupted, preventing a deeper analysis of its specific intent beyond acting as a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://inwebjor.ru/uplcv?utm_term=annexure+b+form+for+fmge+exam PDF link annotation
    • http://amphorabeautyclub.com/campannas/file/jovuradawusapuzavulajikaj.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/346e1178923efefa679e54b2fad78a37/niwukami.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160749b804c2ab---tizir.pdfIn PDF document text
    • https://renault-service.com/userfiles/nogateba.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/xafopijuterewoje.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/52545006696.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839a0c7fb3b---nazoxefopusuji.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/d54f15modras9qrjg39ajrkgg3/wusutemetuvad.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/15419947379.pdfIn PDF document text
    • https://vestol.bg/files/file/degareletitemelafanovabo.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/15ceade22a60f30083d72420a47d81a6/devinawus.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077574c868cb---97941777004.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071991adbefd---pixagepifi.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210612180406855234g57bd.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/cf3726607eae924547ff1881eac702dd/fulizujazogodagot.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cue9q2aqsvmsgnjkg2d2nade62/mimekubewigijulirulisi.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7dd68a8c8---67162831797.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f37f67aec73995b2904ac240ade7101d/58076692938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 5072 bytes
SHA-256: 3d47298d6b9daf2f786aaf4fec77290d63402a931d52eafc848329240f182f0d
font_01_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 11416 bytes
SHA-256: c40730cd6720b04ea7b5d5e919d1e83b7017db7a16fef4b5e51c24a91423d427