Malicious PDF — malware analysis report

Static analysis result for SHA-256 781385100194bd5c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 14:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d985b3c29cf6d0eeaf51a6978e651fe7 SHA-1: 5dede19e98c59cd2647e9c5034e6973976cbe33f SHA-256: 781385100194bd5c7d2a64c45f577fe454b0fa5ebc652211f585db7589f6c633
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports this assessment.

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 https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118e6307aaae---gowekobikobidajogabujis.pdf In PDF document text
    • https://bselink.com/userfiles/file/mivel.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b269448e879---batabixevutodatoj.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/gododasokaxakug.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/fejipelilizaguvenajew.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/welejazufupemi.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/soronova.pdfIn PDF document text
    • http://abroadster.com/files/14858833279.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/94980585032.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/5894bfaff157e072bfff56e104bd8470/vatotofiwitix.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf722fbbc---84463092853.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/17526136200.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a098a4a1afa---72349252895.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d7fa733573---repuwutitux.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/76516102725.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/ns69mavolklccnov6u5rhs5g1t/puzudanepin.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/zolikoz.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e972bf5d721ef270fd4158b04cebd81f/tivuwebimosuza.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b149e4072edc33b930ca6cb90064166d/50017389437.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/20ffa8b21c665cad8d79cdcd296f6160/newuxirakivafa.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/54994409482.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094398544a8e---36569989873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+cosmographic+mystery+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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 18468 bytes
SHA-256: fc4d53704e5d3787c1b73c2fb11137a2e7705e70c221d1e72a94781a16c7ad5c
font_02_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 10996 bytes
SHA-256: 6314b6166db0e9b035524b3e6169bcf0bb9c6ab88f027c66b81be2d6fe741cf5

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