Malicious PDF — malware analysis report

Static analysis result for SHA-256 c161c115a343a4f0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-24 12:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 47ae2b57976c4e1ebafe9c7ee6794cf4 SHA-1: 3d6a353b56b562e83bb92dfc274cd2034ae2bc8c SHA-256: c161c115a343a4f085a7e03a77b009164cb36fc27324c6b1d007e8f7541c8f5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely involving the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://nitecoreromania.ro/files/file/zafuzogu.pdf In PDF document text
    • http://abwwilson.com/uploads/files/zitewu.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/rebaxiwasexegolejopoduwip.pdfIn PDF document text
    • http://opsir.eu/files/file/rodevopalurez.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210913103121.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/gobovufosutosexoboxipero.pdfIn PDF document text
    • http://fitviewer.biz/files/file/86084637589.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f4bc1d5e2f8c010fd32dfc29264a83ff/56587894153.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/88054878251.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/zavizafiron.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/lijowegaxi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613423165a866---tatadiniz.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/vuroxasek.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/robegele.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/fuvaxarunu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/roripokuropofikukogobow.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/7484124338.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/wixiv.pdfIn PDF document text
    • http://studiodelcorso.eu/userfiles/files/rijedulodunatazefun.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/newokebasakoz.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/fapomigobimulajuwofuz.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/dataniserobinagomijisokuz.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wavekegoduvojafatob.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d19dc49c---98553971332.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/noxiwag.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/jijononimosefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=fear+the+walking+dead+6+torrent+magnetPDF 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_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 10852 bytes
SHA-256: c03f098eac3194decdf1480c4e34c61888ff01b74fc89b203f85773345bbd370
font_01_sfnt_off00010586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10586 17732 bytes
SHA-256: be7a0f7a8dc7befa7fddf46050b9fcaf7ab458047f807384cb076cff108f8954
font_02_sfnt_off00013327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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