Malicious PDF — malware analysis report

Static analysis result for SHA-256 c397e496d70c9adc…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 20:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 595ab62afe2c6defd4ead54a9fc588f1 SHA-1: aa4077141607a43211388cb9ff14aa855550322b SHA-256: c397e496d70c9adcaa7d2ced80e5230ef5d8e4689802c725e4a1187d79edea0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The primary purpose appears to be to facilitate phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=convert+fractions+to+decimals+worksheet+year+6 PDF link annotation
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/00cfaa15d1189dd471768befcd6fe4f3/jegemirake.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/xexuxusoposulajalifil.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/47062475070.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607564944f7cc---55704211050.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f203572ef6---50261243778.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8014af6e---mewuneluxuvubinuragabusu.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/9273980596.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f06f07003---84929230873.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/21192366305.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbdc197b6f---27434746213.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/58896257747.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/jenagogovubepegozawu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093fc829f7b5---18373347166.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/budaxunevewujeduxevizi.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/kebud.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/bulovav.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/84578055788.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///10727390935.pdfIn PDF document text
    • https://posh.hr/files/69244936939.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/xapuvezimovolubaz.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070f3716ed13---kugopuveperupijevuxu.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/eb093b0e68a37cc04c014b97cc0df1b1/seforonox.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_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 18596 bytes
SHA-256: 22f0c4713a658bb96a7efefea1d50b172050f975962f098b0e94b544a848ee97
font_01_sfnt_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 11300 bytes
SHA-256: e36b971e2aa8875098bf3a0505d63b467354812d5b4454097877e6f09780d97c
font_02_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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