Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ac51f78f98a5be…

MALICIOUS

PDF

73.8 KB Created: 2021-07-17 20:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: bb0cb673c387385d7c96814a60c8abaf SHA-1: c2b808897a85d69abf925ee8fb30e89b7d1f7d26 SHA-256: 93ac51f78f98a5be9b2f7aaf3242fef3f08622ea9cc476bfbf9ab6c6a6a49f17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pharma-tools.eu/galeria/file/98443254015.pdf In PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tm124ho4puuds2gapad5vo4m81/99811957351.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cccf7172bc---29792474306.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c933c1c9c6f---xajuvagugitufuxofuxaza.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a3e2c6c1---nikuvojipufolowud.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a9c33fd9684b3cc13f0eebf5b80d8ec8/wavovefoxumuxog.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/baramuwerivavodovaf.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/897c505dd3fa235ef75663db12d00ae6/mugukumowu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15a356d18---55013472838.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/wiguxulugomaterumidugi.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a0f8692fc5126dbd1438685a33e11c62/8021213056.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806d1315884---samepamaset.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5s32a6r3ms70p464o3iradm8b4/54846525117.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/sikemomamabuso.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bc9dd4318---xukisufavogiposuruzuzixin.pdfIn PDF document text
    • https://akvaguru.hu/user/file/31867510735.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/regipazevijinifukax.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/11681926314.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/7202888591.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/sukenisidanuludenos.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/52503346306.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5f24l6ms1qu3r4puuaqdeah1p9/gepajewaj.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/98621828315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=tagalog+songbook+with+guitar+chords+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD03 16648 bytes
SHA-256: d9c5f0e1e05aad906810e49c8be247e677c5eadfcd5234171972ef07a6518517
font_01_sfnt_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001004f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004F 11148 bytes
SHA-256: a4a04977d710048763a90e9b092b72248a56eeea276fac07c9cadca6142b5686

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