Malicious PDF — malware analysis report

Static analysis result for SHA-256 db70fdb429b026c4…

MALICIOUS

PDF

97.4 KB Created: 2021-08-09 02:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94063be1ebae5ab03b89cdca0e27ec49 SHA-1: dfd96ec4d8ff652b6caf679d7b03b2c573659eb8 SHA-256: db70fdb429b026c4164dd5392fc8255b5748d026e6be71e7e2a5c97608b103eb
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised websites or disposable hosting, likely to facilitate the download of a second-stage payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://monikaknoblochova.com/userfiles/file/lepotumotisomalizek.pdf
    • https://giriconsultancy.com/content_files/files/mubogusen.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768bb4ca209---bijonafipo.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/490c65ded7d1450e87a48ba1baf9bb81/vizowivamuto.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/d24e1c083ab6506638f8392e960d0836/45617263204.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/798d03b1ac7021c81a77038890631fd7/rebuwifevo.pdf
    • http://yetisirkaucuk.com/firma/files/vakanavaropok.pdf
    • https://advantagelic.com/singhania/downloads/file/waragag.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1b7cc5dc7---83759468548.pdf
    • https://asiarsolutions.com/userfiles/file/65410443009.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5s8bb7cqjjm9sumgt036aplugf/29518318415.pdf
    • https://clickkedai.com/userfiles/file/tononewaniwunatijegede.pdf
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/pavisuvojexunad.pdf
    • https://annekienlen.fr/imagesfile/65302737715.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f49b71f6e---neboru.pdf
    • http://dharmapremipariwar.org/userfiles/file/48102950358.pdf
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/55670407652.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb8b5b131---10163673293.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/217kaja6cjv0eg77th4uv5vh01/fijolipisiba.pdf
    • http://purofirstli.com/userfiles/files/pisejonetitu.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a9d8ab842e---nokesewak.pdf
    • https://eslms.com/userfiles/file/75128075872.pdf
    • http://vanxuantravel.com/upload/files/43242314962.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%B4%D1%80%D0%B0%D0%B9%D0%B2%D0%B5%D1%80+%D0%B4%D0%BB%D1%8F+%D0%BF%D1%80%D0%B8%D0%BD%D1%82%D0%B5%D1%80%D0%B0+samsung+xpress+m2070
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001019f.bin
59bde578e9c2ae4e5771b85376d52c3489dfb72188d307d51b81b768dbbb1342
pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 24360 bytes
font_01_sfnt_off00013eba.bin
e0746da1b59b28bff972f95dcc61b89e0408baad631b2600a879e49832868f61
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBA 12468 bytes
font_02_sfnt_off00015b99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B99 16792 bytes