Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ce92e32d027ef1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-24 12:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 228a0532ee3ecf307668f98e6b1cd72b SHA-1: fd328c5df91b4a50181924633d57d92cffbb69fa SHA-256: c8ce92e32d027ef180eb019b3fcfedbb4613bff07354deb887e4c93ae098496c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO-based lure. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://irlanc.ru/uplcv?utm_term=how+to+access+icloud+contacts+on+android PDF link annotation
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ulqe2g4mt82bu7n2v2kk0uc06t/zadubuxewetuv.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/11386010703.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/161363495262ec---fukekib.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/xujuzedufinisirususe.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/16791020752.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140ed4669e86---33107398791.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/20773391076.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o92rlg3590qj4gmhs5110cdsh6/mokusezuwaretujixozolu.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/94495146445.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/89117379228.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/8341822674.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/nuwukisog.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/jorerulowage.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ac1504217309c5f819b8f8bd26a0e462/43687589186.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/40566501470.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/63040398326.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/21085938498.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/napisulolanepelexot.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3e4b55fd1---28723984996.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/kuletikowofapi.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/42382517327.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/4974136254.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210904140120.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_off0000e4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 10540 bytes
SHA-256: 9584e40d352e28d5ac8fc176a8a29b72b122fdc33a11ec8349e4d231ca862dba
font_02_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 17708 bytes
SHA-256: 722298ec60b2d01c03c3d78798b9cfa83e87b562d8e637d6008c40adcd06da92

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