Malicious PDF — malware analysis report

Static analysis result for SHA-256 303c3ed64c5be8e9…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 06:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6e88d15213b1e3ae3a468b25914acdf3 SHA-1: 9f38f9ed14ebb3e4fd449a9d9dc0c24810cfc337 SHA-256: 303c3ed64c5be8e9e1299e9ced635ad437f176e10f6c5726d860aacf8c359d33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting it functions as a link farm. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=toshiba+air+conditioner+owner%27s+manual PDF link annotation
    • http://chemonova.com/FCKeditor/file/98069614620.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/57050762052.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/bd1d50339ac962443db28980c4290752/83945745212.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df3b101e9e6---89035140023.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/53680099599.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/89564209569.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e93cfa03bb---miligozosominemanugizi.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/19187111597.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e95832b8252bf63395830d7dd8238490/digewobitipus.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8a3ec0cd7---74385299656.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/kenafokuw.pdfIn PDF document text
    • http://gibisch.biz/files/files/80626053572.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/mavakumuwedisaluv.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/popedefasog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68fbf08cd---mofisuwolunowirerofesuzuj.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8f0b8d43---62847664482.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/upofrqiaiitimsupmfebtk2158/11150416279.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/47827181846.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/dijagaput.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/rilalewipibojamanezi.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/9347936374.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/82de8396f222394045f37fd2296412c5/fawevabopupapa.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/taxolebunaxola.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/31545590619.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 10960 bytes
SHA-256: 2a55707a8ea333631e40525ca636b0adc9c61f538a195a5e78d649ffd4e2c41c
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 17164 bytes
SHA-256: 5523425fe02c7b1ecfaed42cc631b27ddc32e73016af581b17c60c1d03e674ec
font_02_sfnt_off00012470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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