Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a41df82b15c43ba…

MALICIOUS

PDF

100.1 KB Created: 2021-09-08 01:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe6d8f9c8bd5d8aabca323929529a89b SHA-1: 521d97030da2172d1c52cbfdee905ff0df46e70a SHA-256: 5a41df82b15c43ba05541037b94df7f31bf351f8d62e84914ed3b34998f3a71f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://berbun.com/user_img/file/figuvukorudu.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/xopagesexekavusif.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/6199600406.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210530002603.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/b63d633047bf1e2eedc91495e95b2c30/51325020574.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779f6297ef3---27331977590.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/atq2p6ko3mg2814sorg2jt41kl/kivedezuvafoda.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/jerolarazosan.pdfIn PDF document text
    • http://axwelindia.com/uploads/kimikidunemakefazizov.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a41431ea469---wetekuwix.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/68298921652.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/65063635990.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/risodisi.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/35299966757.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/f9d5481c850cf4cadc49aea30756bc11/runigupirep.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/jaladexinebotape.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/polenarapu.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609491ff44484---sedegodaj.pdfIn PDF document text
    • https://tigapilar.com/upload/files/tedofaxuwuf.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/01fc86af233163bb94c33e501e9c5798/wimunirevobiva.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed01d88a67---pefet.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/dikusotafatizex.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/segonafebuvonebizixodar.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f4bf71a1ffafe7336f64529eb5c4c033/57310792507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wizard+of+oz+story+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_off00012122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12122 10376 bytes
SHA-256: 6336768c305cfa807129d88e1632c7fe880f3bd55a96abab299fda0fdc086b4d
font_01_sfnt_off000138c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C5 19216 bytes
SHA-256: 69c6e713196bf8d8c3033d4941d9d2948669f58bba90a6a0c426cf38c7d32514
font_02_sfnt_off00016a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.