Malicious PDF — malware analysis report

Static analysis result for SHA-256 071d2042b1c67941…

MALICIOUS

PDF

114.3 KB Created: 2021-09-19 21:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c6d9994425e7fe9336643c2b7a8c78d1 SHA-1: ddad173f7f01ac8652cd806dd639ec98861e640d SHA-256: 071d2042b1c67941f8aef0963b1984e269600be62ecdb2f138f37d3e5524e4bb
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It contains numerous links, with some pointing to compromised CMS upload directories and others forming a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://warungmimpishio2.com/contents/files/2155680084.pdf In PDF document text
    • http://formel1vermietung.de/userfiles/file/kuwupiwix.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///90813276280.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ab4dtbrjss9ht8lvd8mhh76tn8/57763216506.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/7554242424.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/38561879443.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92950659966.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/26315498088.pdfIn PDF document text
    • http://llux.vn/uploads/files/fibuxidixadamumixivin.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aqteao9dnmig7h9dpp7tbrtqs0/30855073756.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/13437916565.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/22032548855.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c95354f330---papelorisi.pdfIn PDF document text
    • https://33mobility.net/uploads/files/33711322265.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/50407867212.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/57708415537.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/49325955199.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tasodixapixexev.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/16913969420.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/36244861619.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/vakezaxoli.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/xilukolalewajek.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/pofox.pdfIn PDF document text
    • http://charivne.info/images/file/64255397646.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/23099316327.pdfIn PDF document text
    • http://www.moyekolodin.com/files/motonezapamarimavirape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=electromagnetic+spectrum+from+lowest+frequency+to+highestPDF 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_off000156a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB7 18944 bytes
SHA-256: 495e3dfae668187fb2baae52d15c0c312ba184e36bd7c1517a32ae2e09e426fe
font_02_sfnt_off0001a070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A070 11356 bytes
SHA-256: 07465f554b5f8e3e630af27173591ae5ab3a9c91c05fc0377489413ff3f9cd3b

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