Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ae89ddec153260f…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 04:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 610a5613b80ae8a2dddc01375208baa6 SHA-1: e030afd32076f2b3b107e97817435a4db81bd301 SHA-256: 2ae89ddec153260f7cf10747fb3f8af086fbb532e8cc77c7c8fa3b1e56cfc696
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of these links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate the document is designed to lure users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://gpmpoolandspa.com/ckfinder/userfiles/files/55151481614.pdf In PDF document text
    • http://farmaciacogliate.it/userfiles/files/13493520388.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/15313574662.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/durapunawagu.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210911181229019551nk77ps7pzfg7.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/1478481464.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210904051628.pdfIn PDF document text
    • http://arucax.am/user_images/file/musenenama.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139865b22b38---22798636283.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/dupitovutu.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/47063320946.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/36914818523.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/17247272420.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/34118027053.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210909_B500B6929B58229E.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091221234931.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630696286bAmK.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/zezigu.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/42288071476.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/gegefikufixarutomabas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcd0c474a0---lovode.pdfIn PDF document text
    • http://markone-tools.com/upload/files/buroxaf.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/1690756584.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161367888e0c4f---75632789654.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/51560451456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+san+andreas+download+mobile+androidPDF 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_off0000c485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC485 10676 bytes
SHA-256: d6576d0ff2ad6996fe518d106ce9b89956793a28fa47a07527f3e688e8c5ace4
font_01_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 20624 bytes
SHA-256: 5836b855edd97254e3fba6237b140dcf48786cdd85c047c7f83a0f88e2bd773e
font_03_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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