Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7ac57221cf037f…

MALICIOUS

PDF

70.7 KB Created: 2021-09-23 01:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 88e3ab6e0eb98ab2529f7bb4e36a0c3c SHA-1: 63fa1a6f9c9a0600aba0a9e7b8d7e6078de66dec SHA-256: 7b7ac57221cf037f4aeb47ba796fd8e3a5f4a2524b56c93dfbe8198fce7a5854
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://globalcenterhotels.com/bot/ckfinder/uf/files/42034940195.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612f299e4ebf1---xitoduxogulinuruw.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/ropube.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/77901053277.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/141709245282.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e2bcd71fc---waboxugofas.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210911_93E9B5239FBC2BD8.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/labemurege.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/11610933396.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/72420275391.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/30729159343.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210916000300.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/4631426007.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/34062669033.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64032d6f0---78014026701.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/34994616615.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/netaxuperelofuxofifi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161396120ebd03---nerurojijoravizamijitekuz.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/mabojuxo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ec92f0f6e923099a44948a80a4048a25/76513439858.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/jonaj.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/mozuselogumida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sum+of+the+infinite+series+formulaPDF 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_off0000b498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB498 15764 bytes
SHA-256: 5ddd05900ec99264e4b1ab01f45d3ea4d9712752920369d15c8cd3b960006b09
font_01_sfnt_off0000dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF9 10656 bytes
SHA-256: 0c992c951072bebd62417cbd33c40e103c32e3f9daaaf48e05be20a651dadadc
font_02_sfnt_off0000f52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1