Malicious PDF — malware analysis report

Static analysis result for SHA-256 b554c81843d56273…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 16:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1cce702d17cc3d1eb7a7af19ea564bc SHA-1: 313e25cc7030fef8ef206e9384ddfa89961dee79 SHA-256: b554c81843d56273eea661dba60e578b1c02ac3cbf299173825105e5e6775d5a
176 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or redirect users to malicious content. The presence of compromised CMS upload links further indicates malicious intent. No scripts were extracted, but the overall structure and URL distribution suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/9249708973.pdf In PDF document text
    • http://ahkkpcm.org/userfiles/mejabune.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/norofiwutasapokujifagewuf.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/81672527853.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/wepenalowa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613547be5c745---95621303697.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/kolirikejuruwozum.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/73643894023.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/bowobufexij.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/92374239832.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/5856388601.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138f99ad06b1---tiwid.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/guvakuvolelanumil.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/42685087513.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/zesubesekugire.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/9031762086142f27a046ff.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/50084609000.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/vuzeleni.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/52072559293.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/lokisamulosaba.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/83555229331.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/xisonakun.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161399b62005fb---bitafatogoboveb.pdfIn PDF document text
    • http://gibisch.org/files/files/jolebigune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=likulator+instagram+mod+apkPDF 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_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 10752 bytes
SHA-256: 6520d092cc4c7f932510cc98e21a7317ac4ee348e072054f882f41a0615309ff
font_01_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 15188 bytes
SHA-256: 315ef70c612dd163b9603321d4939cae2f1d589e63e871ba31a5f8117ecd6b0f
font_02_sfnt_off0000fb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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