Malicious PDF — malware analysis report

Static analysis result for SHA-256 088d9682f58beced…

MALICIOUS

PDF

89.3 KB Created: 2021-08-10 21:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ec095aa6d6606e1f528675240a8d071 SHA-1: 240b2cb566d8dc50bce3053ea49b3503b9336fe2 SHA-256: 088d9682f58beced82f5387370cb483b5440d2fcf06a0cc397fee34829ef76a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of external URI heuristics and link farm indicators supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vivaibonomo.it/userfiles/files/1206201300.pdf In PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/nugetonu.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/fusegiderofolano.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/85684531627.pdfIn PDF document text
    • http://conroeclassof72.com/clients/d/de/de0acc14889d5d69ce6a2e221f3e79cd/File/fubabajukukewus.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/tusokosaropupogiw.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fac89de67b---ropij.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/fuzudogarinatuj.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4a20065f---87003361401.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/rogutudi.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rerusudazi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210515/file/77283748851.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e88c8bf3b60---vufejivumexem.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/78368595199.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/popobo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f84e90ec9---gumuxujaki.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/90608707759.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/48234775230.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5366aec25c328e85df5c602aaf0e74c8/dobavegekedogomiva.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/22a87159490b4052611a63a02578e376/dabiwifawagawademetukaj.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/futuvatusenuzutasopakito.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/potaginoneduso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+make+money+without+a+social+security+cardPDF 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_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 11020 bytes
SHA-256: feadf97827263704668242ca040f51763601da6357d97bc794b5c9da97fae404
font_01_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 17292 bytes
SHA-256: 5f3610675db9068df9d23c17e7ae1c1aef51860d99230060b9a50c002468f919
font_02_sfnt_off00013e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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