Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51d1996265782ef…

MALICIOUS

PDF

106.4 KB Created: 2021-07-01 19:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e5ef4e3d088f7b8becf6395fed110d68 SHA-1: 8179643767da911fc41beaa3e793ed7c3f749dd7 SHA-256: b51d1996265782ef08ff53b2d025b69fb0af213849f1ba319fd6c434797b1b71
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised and disposable domains, suggesting an attempt to redirect users to malicious content. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a tactic of using SEO-optimized or compromised sites to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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 http://tulsamemorialclassof71.com/clients/84987/File/10224472381.pdf In PDF document text
    • http://afgventuregroup.com/cfiles/file/kutuxumifarokikonoxu.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/jinovidujujefapokis.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a12915d0e4---60570110137.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e2dfce37c149ca2eb6306e46bf921584/kuketekibo.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e9ffbef368f724b3d5c8090160b1cbe4/25420117832.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/zivanadevapipenogumiton.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/71657803650.pdfIn PDF document text
    • http://zuche0551.com/upload/file/74267854284.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/76498633469.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf4e59121---88548283892.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///tigatadim.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/68885579125b4f186e12051016889882/54420197949.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/57420346842.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/45e2f0fded599e64b3299901e13e6def/57582101055.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/sumokagoluxuguduzu.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/i6dorflm4ukm7dlhjgf2lddv3g/vimax.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883d04c90b---68820329882.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/aeb7bc736ead4bde39567b20324db4cb/gisusunurubadozagedibixod.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16071984583806---sarevunap.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/lazerirapigunodiporoj.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e4f9523a6bc54b07c9e209ea643f82ed/beboxejuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=system+requirement+specificationPDF 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_off00013de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE0 17300 bytes
SHA-256: 8d8836a4264ab0c735c6807afd159e03905ba022230a5e6f72a9ecdfe4e5bf7f
font_01_sfnt_off00016acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000182e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E6 11032 bytes
SHA-256: f162b48b1e5d7f79f8ad4b9018188023f065e98fb73a6456970cb1661cc414c4

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