Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6b3aae24feb4b7…

MALICIOUS

PDF

73.8 KB Created: 2021-07-08 13:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bccec6ada734ccaaa0e5cd6b0c39591d SHA-1: cfa6ca1ee24b1c08f3cc8effa78734a58754ea45 SHA-256: 4a6b3aae24feb4b77ba2f196db11360ca36c84bce8ea982448b0c2712856e792
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 a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of numerous external URIs and a link farm structure strongly suggests a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b90a79b9466---18475601962.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096221d4f359---93268356658.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a4efdfecb49fb686ae8f14c6794c67ca/mabiteve.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ed06bbaad---23993024229.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/508e56b4fde30e9d3135c198ec60ff60/sixose.pdfIn PDF document text
    • https://sanidom.pl/img/file/76711994649.pdfIn PDF document text
    • http://teplospectr.ru/images/files/26114757381.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/tivotenutivefotukerod.pdfIn PDF document text
    • http://alexdisinfestazioni.com/userfiles/files/sawofugikepetotexofezene.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/0c8598df5368e7c9325dc5c6dd058144/zamek.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/3772634785.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/fceaac00dea21f76c43dc185ff1564c9/98311426971.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bue9dufr6p4eho7ivi33f9gtft/61406751584.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/88537671980.pdfIn PDF document text
    • http://amandamaitland.com/images/file/25321498288.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/ritixubepafazejomovup.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/fubuvivopuz.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/74718b3f7536ffbc0998d8c69793256b/43026577236.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/45685460102.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ccc346c51d6552f93fd95ee814af041/95950627544.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/s275lu3ghjr1ihh3g3spp28vm5/lazomovewajawejigonixup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=top+of+the+world+james+cagneyPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/5ce13f4bf078f03abe8ead3a6d3b2c63/53362262968.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_off0000bd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD70 16364 bytes
SHA-256: 1cf114f962f77c5b0626afe8a7ce1f94a8d5be92c11856de5b9d686af0ceeda0
font_01_sfnt_off0000e7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EE 11268 bytes
SHA-256: d91bfc560cfb7c4a66f9889ed402383a3fb0bf749dd1446f80fe5c894c3cfa2a
font_02_sfnt_off00010222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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