Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4a2708a2c655a0d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-05 10:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 56741a7bd37ed973ec87749ce92078ec SHA-1: a5b66e8eabca1e69f28a06890486ee2d74e1ab07 SHA-256: d4a2708a2c655a0db6a5f8edc84c6de9255657f4b97302b48c616ca7c083bcf8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of a visual download button further supports a lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/da224b0011574a026ca921e3fd372cea/42415278600.pdf In PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3000ed0de---lenotuwopogerelaburif.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/39833327557.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/gimanurofutewej.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/wofanokagobod.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/dalekaluremalezevibalova.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/30721584792.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/129ca548250a97fd858f186dcf3546df/85401028460.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/52sha5fc7kf3bqca2pg33p245s/69110052969.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/dasufovezuzodudavefigeji.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/60185255185.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/59994446886.pdfIn PDF document text
    • https://isosklo.cz/uploads/fojodazigorulugorasu.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/72f9dc39a7a145ab22f4059cb676c1fb/bivofebitorukovojof.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/temopufejapezepidaf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5b0b34054e3d9a91f6801e04e6543217/perozuwinigosarit.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/914e46afc871e6d7747def095f4e4295/93105878116.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e86a3dad5646d9a4010625d08d83cd47/xutubu.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/tilojakuvus.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/37f59kbe3lni12ek18bvngmvt6/kelinanizuzeru.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fde67a3b---40579988086.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/kiwexuwiditabexotifubipa.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/sinugefaxisizuli.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/7864287460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=reham+khan+book+pdf+in+urdu+free+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f6ab2739---9807126424.pdfIn PDF document text
    • 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_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 10960 bytes
SHA-256: f54d9080e419fdb26a74d50d56c4ddda9d2936fc5b49dbb1417c55978d7491de
font_01_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 18372 bytes
SHA-256: 6588a9dd4d5ffd99533b4a9fb60a36649156d0103411451c46ff69d86f04099f
font_02_sfnt_off0001213b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1213B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.