Malicious PDF — malware analysis report

Static analysis result for SHA-256 983bcb96df96cd7c…

MALICIOUS

PDF

77.8 KB Created: 2021-09-05 13:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8657c8d1c9775216d0b4498be0333ccf SHA-1: 947a1d5cfd180856f174644286858e7a7c73ae4e SHA-256: 983bcb96df96cd7c96de5e8a03d6976387ae04c10172fb228b2cb10789327734
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like PDF_URI and PDF_URI_IP_LITERAL further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/74ceaaf344ef6d2cddbae66c97a3a1ba/ruwulujujor.pdf In PDF document text
    • https://bselink.com/userfiles/file/90806956781.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f37c1baf---22568788125.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/85438570343.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cff686d863c---18435036064.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/soxese.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/34737488511.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/bemopep.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/mibub.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/979a1c5377fec76ad8a6318c164e69c8/sojivelok.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/26647489339.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///32015034270.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428232236911385.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/cm5regdoasljjpqbtmsrtcianv/jigokal.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/01/delesowigijukenobalekek.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd28e8952b---47538056060.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608308dc5e0ee---vasuxakujijew.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/749a7ac9c5aba1d3c78746793bd0c237/50949454429.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/71766525624.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/54548188299.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/61430992345.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55bd5dbe7d---13940701755.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/wimagemowugimab.pdfPDF link annotation
    • http://nceed.kr/pds/userfiles/files/zirut.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fb1c84ea4cd318f4187e021c80be2996/74179718411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bruno+mars+count+on+me+ukulele+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_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 10936 bytes
SHA-256: c29fa16ef35b882528149569e80305a15a1cd1222bfe873b002b0834f1076134
font_02_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 18492 bytes
SHA-256: fc7fd09c38ca2c11199d13b88c10b7f9c4a4049976c0f6032d1bc5a379e95618

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