Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e8327797f73520…

MALICIOUS

PDF

91.6 KB Created: 2021-08-15 15:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8ceda2b5b1105397565963d805926292 SHA-1: 57ed288dca467166ea3f76e3ab5d0b4e92aa270b SHA-256: d1e8327797f735203482286636c367c67de3737fd42670dd97680b71958d9598
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to websites hosted on compromised content management systems or disposable hosting. The ML classifier and ClamAV heuristic strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.allatpatikapecs.hu/images/file/1433479023.pdf In PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/runovovuj.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/jusosoxasazanivawafeworo.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/5988986255.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/wodotimidurexexebepitadij.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/26958531375.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b21cad972---kobejawularekijosekigo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/g9d5kq5etd9a53upfj2eh3dq04/99293443530.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/69ifo83e19scshohg8t76c0av5/72307714576.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ocm8mivvlo7gvh2sqm7r40pfnd/jixowafawapijesigufemolop.pdfIn PDF document text
    • https://kueapem.com/contents//files/kejipetolobotikusumazi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a207cf6c669---girunanafisimisuxi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cb4f44775---51204337369.pdfIn PDF document text
    • https://aspirans.com/files/file/timezim.pdfIn PDF document text
    • http://candientushinko.com/images/file/lataru.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/94261507687.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9e1f2c36b---rutilelorugofe.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/29323089617.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/528607b6762844021f3d3ce5f4b9c381/fubosej.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d49603c5c---42909030939.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/31972901580.pdfIn PDF document text
    • http://www.bash.cl/media/file/wefinelibuf.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bec08964b8---wikuwowobe.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fawapurekigomituzajomav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pete+seeger+little+boxes+songPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 10364 bytes
SHA-256: af31039ce567171a5937a6063b1920eaf3a67783547788ce7a2146e67bfc61fb
font_02_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 17744 bytes
SHA-256: b99f66c0c9ccb2afcaaeb276e94a4f204e92947bd2299e7ca4a4f7e65e462d9a
font_03_sfnt_off0001473f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473F 16904 bytes
SHA-256: e92a30a47bd2c151c90bf8bcba74ec34e9b92d8a0eb666e1e23e063328ec7863

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