Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4e42a3e47cc6910…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 23:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54c4d4eb27053b5c29ae83ca9dd91a7d SHA-1: ea6b8d0ecb5ec169b4a6feff7984ceca6c493a26 SHA-256: e4e42a3e47cc691042891b20803de0e3c5717b9588c8b8d34b8ca004dd70cac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms on potentially disposable or compromised hosting indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ojp5nsod8b95aj33v5b2gtn20l/14176459440.pdf In PDF document text
    • http://sdes.in/uploads/20366950239.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/metazutirelejanu.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/kejitom.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/vesoremedorifuxewugi.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/98095653578.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094754a02ef7---40870146302.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cf26c1121d8---raxenikemegiw.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/xokipugokudita.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/busuxebufavukazubasuvux.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/3230017654.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/60001372414.pdfIn PDF document text
    • http://thehonourride.ca/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/3579339681.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9a34bcf0---lupuzoliwodowumerim.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/62511733888.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8885f455b055f8b755e86813def720c5/84150235256.pdfIn PDF document text
    • http://planetamama.ru/files/file/vawuwo.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/xikenonabotiwuveg.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/lozozidinubaragemed.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/17074726764.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/parofade.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/9899631719.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/72659548038.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/97784184647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=ovulation+tracker+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_off0000e2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F6 10728 bytes
SHA-256: 76c0867546a97e0022061cc075b2e7914b347f1677421e6ea55036560b0f83ff
font_01_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 18148 bytes
SHA-256: d7a5896190858a50c1da798f22e4c928c8a66ea0a242618f1f625c014f62523d