Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e157a4a3fb83734…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 22:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fd982d46ad6b9121f8d7ab399a52f7a5 SHA-1: 4a19ee085ef61ca5ceec4952f76c68708152b0bc SHA-256: 0e157a4a3fb8373438d8ba48140e6aee7e2abf08f9248e4a8fb3104cc52bac3a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=supernatural+season+6+year PDF link annotation
    • http://orchid-daikanyama.com/userfiles/file/winan.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368757989d7---nogizubibimufebetomib.pdfIn PDF document text
    • https://rotitelor.com/contents/files/86865906938.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/zubapojenepexuxutu.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wavasimurodusesopekine.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1400030dd---11430236559.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/af5c1ef6d4a23db2687fe6793c888fef/bajejebosovaferidopunopu.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/lotajozeduzaba.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/49529581498.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/12367263199.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/100815ac27c4ee845a84684242317d6a/73782243343.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/568b4860e670ea14dd25a9ebf7434fa2/rosonekulomedawezaka.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/87833610436.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141473cb3eba---zojiviremasudilujakaxokup.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/wanozoruzux.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161348de9b2108---jidoraxutedepubis.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/disabuxataposenivimiriz.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/wupileworudulibiru.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/17949843579.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/bomuzosiwomajosujubusif.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/53636585488.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/39898131657.pdfIn PDF document text
    • http://bdsductri.com/upload/files/69322622209.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/96844362012.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e41e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC30 17308 bytes
SHA-256: c14debfaccedba01871f6abc7ad3e38600d4d613b630c76bcb75fbe121250f92
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 10608 bytes
SHA-256: 12f28825817cec4d85703212bc29511848d16ae6b269e2357f1cb725b25b2f02

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