Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd91c76d2383c61…

MALICIOUS

PDF

80.3 KB Created: 2021-07-22 23:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 37dc33b356c29fa6855e67215f5b9456 SHA-1: 19d94602b4045621e01c25be1844d5f34ca914a4 SHA-256: 6dd91c76d2383c61c55d0cf2f757451cac94dea5e47f53ea8e106d5f883ac3ed
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering further malicious content. The PDF also features a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zlato-eu.cz/upload/files/mogovok.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c70ea4f090c1669f721df188e35fb998/fogobome.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/1768181327.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/55015677884.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210528_9BA3FF23EDC5F53C.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/41447251636.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/98058546958.pdfIn PDF document text
    • https://kimansion.com/uploads/file/zisibojoxakakidile.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad993dfe3---bodupiwu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/46788fd6be321810c362cfa131864a32/21131863379.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e171b8db2---lofibefotumomilunevikika.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/69785497591.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/fevefidopegudapuxolanaj.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a927a6aa42---73946721073.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/59869285652.pdfIn PDF document text
    • http://rhondachem.com/d/files/laveximivawamezesabisib.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622672186.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jeu7mvgv4bo03mlsv3tk8963lo/68108155608.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c990f9463da---45149656071.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210529065510.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/75124274459.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/kazudaf.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ej3fs8vdci4jikfjrrgscb0sg1/jonagebefefurolimuxir.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/goxarexowoleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=young+green+dragon+dndPDF 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_off0000d391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA8 10100 bytes
SHA-256: f3c152d9e8659034f07899114e7a09c26c0bb261f2dc5aab99e01bb60f5b5e58
font_02_sfnt_off00010210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10210 18660 bytes
SHA-256: b419dfe3f3d78da9c6acaedb2135a55c463e6e2239a029edc41e82320c6de9c2

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