Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fbc5b382033b66…

MALICIOUS

PDF

94.8 KB Created: 2021-09-07 09:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aff475dfcf38eeb492d0f39977e74de5 SHA-1: 0d44f87c77c85387aa622cbec43450dd429f2d23 SHA-256: 54fbc5b382033b66e51649241c20503ecfc7b675755f5796ec2caf721cb975a3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://yeongwonenc.com/userfiles/file/kapisudofevu.pdf In PDF document text
    • http://voszveszprem.hu/_user/file/72084549510.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210816014804223.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/sojadojisekiva.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/83168085401.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/84096590278.pdfIn PDF document text
    • https://777mto.info/contents/files/83790439768.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/36f2f201652916c7150a30a3902adcad/7547432212.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/21641777139.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/57965491893.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210901091526_y66p1m.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/b7bf2048c5ae3e8ef32e5fd4d15d9011/kobovupomixagosokowitina.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/00e1c6329964bb9a954516b5fe528a9d/61385945088.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa8fba09c9---55657599079.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/60514531307.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/32138e62660d5ef3b5020736d5d74631/19258450658.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/32828812651.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5025a64c0---51850669182.pdfIn PDF document text
    • http://findplusltd.com/file/xexepume.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120854b9e831---notumenigexidurok.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/puwafufukadipavogomul.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/85612804290.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d821954e49a31c79312c800c7e018269/bonuguwigujakawibodi.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///82226414428.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210820_010411.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=chapter+2+linear+motion+worksheet+answersPDF 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_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 18616 bytes
SHA-256: 4b5e49fdfd24819ffb84164426efcbcf475cf9885e18039359196067bcc1fe09
font_01_sfnt_off00013bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BEA 10848 bytes
SHA-256: ed09fc29fb95f7d5b4044e773c79547a72a96059578cc21d1f89f5b372298bc9
font_02_sfnt_off000154ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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