Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05d8d13f373c2c2…

MALICIOUS

PDF

75.8 KB Created: 2021-09-05 14:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bad1c5c72519873381c5f5df5bc22341 SHA-1: e8b00582e5340ae95dc38ac3fb5592dab8842a7b SHA-256: d05d8d13f373c2c2b35c29dd6e0e9d47c04baf071bf280942e313a0deae68188
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to potentially compromised websites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to malicious content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/74e34a7ba3438487208da3476b29c3f6/40388084685.pdf In PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/vih0178g4mvsekfmqvj4a610hv/zujojokapupabarawit.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a52f334242---vuzokevot.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nugasaxejaperelumogis.pdfIn PDF document text
    • http://195exim.com/datas/files/83655994391.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/57926254931.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/24534704781.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/funovamik.pdfIn PDF document text
    • http://deficanderel.com/clients/6/67/674a09facce11b7629d390eef9534ff9/File/notonopedug.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/fisopolajajudenebis.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/82016857018.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210623_064405.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5oo5m9sbbf4rpqhbe9oe28u244/9210271674.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/9467686115.pdfIn PDF document text
    • http://servmed.net/userfiles/file/ximakimasufuji.pdfIn PDF document text
    • https://latework.cz/soubory/dilis.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/xuvisa.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a84caf4f740---kamemuf.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/35316435792.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/wuwofumudarumotofolumok.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d823760b1---subopivanuwibanax.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/62275365782.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88694a364a---45949175397.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/lutev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dental+local+anesthesia+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_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 18524 bytes
SHA-256: 6cae5a2036142e1ac185db431a75943ae4b2a4c6eb0839784a13d7496a20add0
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 10620 bytes
SHA-256: ee8d9457a4b263b09b4d0c20a5e0c93061285ae5f1448f6c24b05c92ac1665dd

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