Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3526db978fde21…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 13:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e5950e5e77d48e9490baa2497145471 SHA-1: 842fee190e5ae5df7e777f1ce100e115e186f348 SHA-256: fb3526db978fde21ad73100fb16c2d4d5f3e680f16f8c1564b272ae071c627a2
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to lure users to malicious content. The presence of a 'download' button heuristic further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 https://synerhu.ru/uplcv?utm_term=babbu+bains+full+movie+watch+online PDF link annotation
    • http://fsanaq.com/upload/file/210902014345324502ajp8gpp0ue6a.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/79430936398.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/pofumumuxibo.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109010048294426.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/webojorosuramoros.pdfIn PDF document text
    • https://kaparatt.com/images/File/95281794176.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/63826741093.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/67476637949.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sidutepudomanajamakofi.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/52937815764.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139429672582---96459429034.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136622ccf8bc---32517845757.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/2125774107.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/kuvixexiw.pdfIn PDF document text
    • https://fivetc.net/uploads/files/dewux.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79a382e89---21290458740.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/lisibowaseseladibitikuw.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/tovenulusijegis.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/64124333360.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/89432150036.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2e8e28c7---vawata.pdfIn PDF document text
    • http://nemalipics.com/30501503899.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/37261668915.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/sagutelelelanuxemovolo.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/50103101287.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/98923717892.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/76383658373.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_off0000e6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EE 10944 bytes
SHA-256: 51e930c4c7a681de35c4c4319f5edeb47c9a088977e6cec2b73476e4ee96e50f
font_01_sfnt_off0001003b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003B 18228 bytes
SHA-256: cc941a6429c0465a5e635ac61e043b999ed802f826c748df1a797fe074eeaea8
font_02_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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