Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab2a2f11e7e3f22…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 00:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dab571b0f4fd42aa870cd542a9c64a8c SHA-1: 1622a1c84d3e492bea858648d779baaf832623bb SHA-256: dab2a2f11e7e3f22b4bb3d6308b3a4ea1fb0a5a81f77b64f52ba029f10db3f56
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 links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=datepicker+tutorial+android PDF link annotation
    • https://jodhpurtravels.com/nbloom/fckuploads/file/40213318614.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db72f91761b13334ab1bfc3de07dbbf4/42261552926.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/1914412199.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132745e700c1---18730591956.pdfIn PDF document text
    • http://irollee.com/userfiles/file/81812819453.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/69460737541.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/guveroxugopuromadexefulip.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614146305b9d7---10214744921.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/61320839318.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161301c149fd95---megawudumokuwet.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/95387637424.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161437f7dde995---xawid.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/kepizudirudakivatom.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/75547145628.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/63780700069.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109022323021822.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/7132648516.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/rimoguzud.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210909194921_mhgn7o.pdfIn PDF document text
    • http://castel.lu/userfiles/files/79283655137.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/fcf06b7726900f94266242996b4dd787/71337890725.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/23344683135.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/99547476300.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea12aa9467---43764739467.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/tatoruwiw.pdfIn 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://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_off0000be99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE99 17004 bytes
SHA-256: b26a83038a235ffa40905ca0e4977efcac67bbb814bf11fc56684956b0a29644
font_01_sfnt_off0000eb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6A 10532 bytes
SHA-256: aa28379a9b249a936234e69e9bfa65ae5caff7cd8875001f6de886d3f459a08b
font_02_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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