Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bb55e1f55fdad6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 16:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e0fc63801ac83b32dcc645cfd051ea3 SHA-1: 006dc186d1ee9e6b7c02d130090b0d616d03ebfd SHA-256: 19bb55e1f55fdad68fbf03098359a063724c6f06384a38aebe1645dd4682feb9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs, many with UTM parameters suggesting tracking, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=livro+gordon+cullen+paisagem+urbana+pdf PDF link annotation
    • http://e-hematologica.com/users/file/51911194391.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/lurot.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/fenakomigetaxajinejip.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210905_060511_6903.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326006632ac---54889709965.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/vosovep.pdfIn PDF document text
    • http://allier-genealogie.org/File:/damazo.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b70dd91ca---fodazupotaligapetu.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/48001672323.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/76014373481.pdfIn PDF document text
    • http://bjjiffy.com/upload/88414429384.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sg5ftvbjo06jdl5q9u1a8vv3t7/jidigupiwitarunez.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/wulidofugi.pdfIn PDF document text
    • http://xhzhengli.com/upload/65436437829.pdfIn PDF document text
    • http://pileki.com/imgup/file/ralenefugokububumexizedos.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/62280410667.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/zomujaxunivaxo.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/tisegixovokezusokifa.pdfIn PDF document text
    • https://kokomanis.com/contents/files/78770638306.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/tiror.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/51826392403.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_off0000d7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 19048 bytes
SHA-256: 62d608a7d49a6152c616ce9f9d17a1b1f6078fb1934d762e95c37aed01752679
font_02_sfnt_off0001209d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209D 11128 bytes
SHA-256: b680c59b031cfdfec633a8b4a66be67c635508dc2b20c31575ace5df04e38d1f

Open this report in the interactive analyzer, or submit your own file for analysis.