Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6dc649d0a206d1…

MALICIOUS

PDF

91.3 KB Created: 2021-09-03 03:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d8850640059dffe6ded23027004da551 SHA-1: 51c097651af19a9e359bf6c6d58ed61cf9b192dd SHA-256: de6dc649d0a206d1fae307c22a8e0062fcbbeb5a102e822d48cbee4be2896fd5
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised CMS platforms. The primary attack pattern involves luring users to click these links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160730bb69bfdd---1119384773.pdf In PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/18866239714.pdfIn PDF document text
    • https://asiapharma.la/files/files/69030351255.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/pilijemitasidami.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/70584973041.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1626512405.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/78962605647.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a69f3f7102f8b20f95b0599d6df8ca5c/rasexorobefeborutitol.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c667a0aafcf---37172560270.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/1ue44oh5r277i28j3eubtsvoc5/vefixekuja.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53650103184.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/19864466951.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa804323e---81956774632.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062612031373499.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091031d349d2---16172798989.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/4846288672.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc57c835e38---porixel.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/jvjuago6l9qf594l2rsp366dcf516o45/xevakitopuxosiron.pdfIn PDF document text
    • http://hkalc.com/userfiles/kugetogalugufufepi.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/72548371809.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4667a055d---volebuxixikipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=modern+philosophers+and+their+philosophy+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA9 18148 bytes
SHA-256: 9b44dbfbdbb1e2156d72d8b122e0642621d400ff4569f49364ca5811daee6fe6
font_01_sfnt_off0000fb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB72 10700 bytes
SHA-256: 3f18b7563777eee802ebcebbd0108cd5c2ae0333844b01892968afe2cf36771f
font_02_sfnt_off000113e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 19464 bytes
SHA-256: 516bb3ba049a4bb01a5fe3d1560c3e720893c5d8ff2ae50fc23570666480209e
font_03_sfnt_off000146ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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