Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07ad6b56e1321eb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 07:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 09f146d51b5afe00bbf34b1f7225a8aa SHA-1: c38e5885a6b4a21f4a9ce4f01aa94b443ee2b351 SHA-256: b07ad6b56e1321eba6c3174a15f8bba00e8d89102add7523986a73fe8ba23b8f
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress upload directories. While no scripts were directly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://sungsam.net/userData/board/file/tugidudeg.pdf In PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161369106e8c29---22769998783.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/27614588779.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613acf7de5e0d---jusila.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907145022_582761472.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/80054661681.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/43459269743.pdfIn PDF document text
    • http://cartopack.be/Images/file/jokexuzuwinusevibijexe.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/likoma.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/jefurigolazigametarabiv.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/16186557286.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/dijinovifinogudupi.pdfIn PDF document text
    • https://intersat.lv/files/file/pazojeterulakatabado.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/9236226883.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/fowukir.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/34388377658.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3eec804b038dc990681e1ca450bf62b7/99223499557.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/megur.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422f62139cc---49476044481.pdfIn PDF document text
    • http://flirdining.com/uploads/files/netanasotu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6363ff520cd1d5935a37f5de13e3c5a0/ligajumenonobodoxo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6f53e79a125092db0fa3908a23f0aa5c/mepug.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/livixawufisitazitap.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/doxibe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=videostar+free+iosPDF 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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 18272 bytes
SHA-256: 35136f75fa1f7c5aed56ac58ff71e3ac8dab656825bb26706138a8f362b7233a
font_01_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 10168 bytes
SHA-256: de4b030775b9310f3b24cbff591055e3fb847af08519f278245789cb0e870237
font_02_sfnt_off00012bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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