Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8451863541dfa2c…

MALICIOUS

PDF

88.4 KB Created: 2021-06-25 23:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 07e53c48ae9e3e9bd27ff903a1dd5242 SHA-1: 4c81d3853008a0fa4ca11a337f85f02b7eea0147 SHA-256: e8451863541dfa2caa1359396ea6095df6e5045df3f0c8b47409e5674fd0a404
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/eaaf5946634ee0890f4e03ddff9abca0/najosimexewulun.pdf In PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea756b90d9---49328815556.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/zolibex.pdfIn PDF document text
    • http://alanurturizm.com/rsm/files/pogewefetetulajifabu.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd54491454---rozifego.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e0e550d7f---jubedarurokumomufiwa.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce143d23ae---18176526363.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060806465197.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/10b27beb69cae6ae07d658c1563404de/bowanifixomizirufidaroz.pdfIn PDF document text
    • https://qnzar.com/files/ponawabize.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/waremikanozofepipin.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/5f7dd39a033905efa5cb7cf02c8beae2/jesigoka.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/53j8ml6a7gaule0i7b6kj43l2u/murakigigukuzope.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/mupobofogefume.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052311515896.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/nekce4vju8t40ms7p33isebrf6/36279311235.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074362544e4b---dinijer.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/mt91babkh12jlmbvh176s3h7h1/13334611031.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c404ab6bec7---46877505838.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608084e849904---51993696983.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zupod.pdfIn PDF document text
    • https://hirurgija.me//files/kakevobazakufup.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb735fb3e0b---99079794962.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d9dd4a5ab6d0f3037b647d0a5afff1a3/tatoberimomifijosuti.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723008b7f6f---21710481012.pdfIn PDF document text
    • https://angkalaris.com/contents//files/20663360257.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=think+of+together+nyt+crosswordPDF 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_off0000f154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001096b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096B 10804 bytes
SHA-256: d9ff1643fe98747a7deca46ff3a2f9ceb9bdeae83c8a213595a456f0db8fe821
font_02_sfnt_off0001222a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222A 19632 bytes
SHA-256: 48f5326de4d2ad6aacc50e2d80cfc2db82d601f3974e8663f12b0bb169c74fef

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