Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28603eae50e1fe8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-15 21:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e7f86e83a407616bbf18f5a5d25ffa2 SHA-1: d9006675257d5eac41431576c8bb0e6a49ece144 SHA-256: c28603eae50e1fe884c706a9ca8b79057834270bf6681ee825979a98568a2122
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The document also features a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=install+live+net+tv+on+android PDF link annotation
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613395211751d---78727048432.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/33789831880.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/nefakesepugivojosipurike.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/43007479511.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f3410eee7462edda3b5821576d460d0b/35924981882.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/wefasoseve.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/53571404632.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/26573711176.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wavinome.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/guvedenaguviwovi.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vinoforovajegijero.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/17010190974.pdfIn PDF document text
    • http://findusafranchise.com/files/files/75297376199.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613968984d0e9---pewavolemibufobakelu.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210905175242.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/duwirililamabam.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/tufinajixazajilegukumeb.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/robazatunogozakorazepuriw.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210905135533_431823.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/94874965123.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/fefuvitilosililutovase.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/36772085784.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/38c094ff93a6f4b9defef67d5f0d60b5/14135616892.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/faxobuxetaf.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/16495383050.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_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 10260 bytes
SHA-256: 1c9e4b86afecd303e03219643191ce63dfc831a11813392d2908cb6496346f11
font_01_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF559 16568 bytes
SHA-256: b5255ba20577384369a553cfbb29c4e526d253043174709b11e18cc3276fcc88

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