Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb1b1a12a4d66195…

MALICIOUS

PDF

81.6 KB Created: 2021-10-12 15:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3457fd1fa419d1fb413797cfd78c4748 SHA-1: ece7b9d09d5a6c2b3cb3f3b2c9e7020a84969af5 SHA-256: fb1b1a12a4d66195b7d7061e4820f5ef88379eabba3e16f8fe621969b9962e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while many are unknown or benign, contribute to the overall pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/l18brflr4604rs19djgtf3enf4/49863219683.pdf In PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/bisevomitejaturuwiduxonu.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/21976473854.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/fenenen.pdfIn PDF document text
    • http://agrion.org/upload/fichier/runurefala.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be9893079---zurazupejowoxurudegufub.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/pigelegesixuje.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/8069119177.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///rarozina.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/bameni.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615c65cc70a4d---56579928098.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e379c8f9348cea6ff5dc356745f3a59b/pisunijog.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/wikaworagadiselu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/7918283351.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/xuluda.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/kafavosegiworan.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/60009438609.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/65543462030.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/41378328972.pdfIn PDF document text
    • http://sdhmladavozice.cz/userfiles/file/91406636801.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/gikolebivi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/Z3ufxtS7Wvw/uplcv?utm_term=what+key+is+shift+on+a+keyboardPDF 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_off0000d491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD491 10744 bytes
SHA-256: e03e10efec320405655050e8d536584ee20786739b972dc458410f90cbdb0daa
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 19788 bytes
SHA-256: 29cedbabb6109e7bd67c763fe432ca558a286b6c55e38b47bcdab4a52655d3f1
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1