Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef50ee580e37272…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 03:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21beebbc056f1a11c9d8af31170d7d51 SHA-1: 79ba8df092c651010490899bff7cf8bdc2a7cc4b SHA-256: 0ef50ee580e37272fd4fcbf2f64bf830f28da04f96b396fad5463e2b9ff3529b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to lure users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bya-ingenieria.com/ckfinder/userfiles/files/13310633672.pdf In PDF document text
    • http://punaide.com/userfiles/files/kefisawuburubod.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/wumajuzobadubilu.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/veturigitu.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/428467097.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/88313527793.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/34415886200.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/33429181611.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/6209211261.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/28514826380.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c6905660ef217a289dacb57754cfbcd9/zezudawotudoba.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/gipetisavok.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210902140850.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/miloxagojereboromifolibu.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/47244099306.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9cc623693---67469468286.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/80072828170.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/wijujaxanigasonoladewupo.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/zajux.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/fekexuberavudupi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e02376db2e---muzebavikuwerute.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/99025974169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=300mb+movies+onlinePDF 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_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 17384 bytes
SHA-256: b1febe16b1610219a379c3916cfc76f0eb79fb026c21ed28d49808eaab0f096b
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 10312 bytes
SHA-256: 6e84d71d23d204d165876531fc3a3918b5356c240b9a3f789fe9673af419ee7c