Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ddb3ba3d6e10d59…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 12:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdc9862199857d0c9b6d8a03d0a44080 SHA-1: b823eb59377266f1b3249301030becb650eda2b6 SHA-256: 6ddb3ba3d6e10d5980d2a91c2b315d9aedfbcf3d1a83f1dabd1e2a2dca6dad79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4cb0fdf10ad9272fdea1486f7d16ef43/43715271170.pdf In PDF document text
    • http://turinhotelcompany.com/userfiles/files/fuwivalabevef.pdfIn PDF document text
    • http://topas.lt/userfiles/file/dilokumuvoviboluvofoxuwe.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/b7b7ckdeckbprs461bbom66og0/lexavivuduluken.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/novosireruvupilik.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/zonome.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/guxasegaveravasukerajugi.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/60547936450.pdfIn PDF document text
    • https://topupdana.com/contents//files/pumogikuzewa.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f1d5022a---87620176550.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d955ac49919---nasil.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3ebad75ad---95695636100.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb1fa78e59---jilokalirezowiramibejeme.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/tujojezi.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/53968673033.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/99c7d6ce8e8befdb7c3152e1c311c140/dujutezolafikulixojej.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/40453361050.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210813052323.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/93c4e38c2a948847c694ba1c4a1c2efa/diwutusuzowudiwigo.pdfIn PDF document text
    • http://casaalu.com/luutru/files/zaxesegiwonakiladebapex.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4ef1ae1e1---gazoriweguvof.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/nabufuvega.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/ef34474d04a3101b394c99be02bf9744/51276227583.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb4d80aeb9---lawudolaj.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d268a7b6---57759204095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=160+lbs+is+how+many+kgPDF 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_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001178e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178E 10904 bytes
SHA-256: c3ef67ec63101b1ace28bf89a3f766b158366dc6d987fb7b1393ea35e65c8570
font_02_sfnt_off000130a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A3 16884 bytes
SHA-256: 28a1c01f06131b00e5adacf31f07603f8eaaff11fb1a6d515caa3b998dc5d9ef

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