Malicious PDF — malware analysis report

Static analysis result for SHA-256 de401595754467e0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 04:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9a71304b2b96a51a5b67e1f43a2b8e92 SHA-1: 2af633ba22696714234d1b45e1e7fd4bd4f85c76 SHA-256: de401595754467e04f718c00428be00f64e21b0db22b0226b3f8e3199d3498c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or directing users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://philabc.ru/uplcv?utm_term=android+stolen+phone PDF link annotation
    • https://www.utn.ac.cr/sites/default/files/files/sidutenizife.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/27868718969.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/gifasapirag.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/11995106353.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/buwakomojituxowezivabomag.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e5e20a4fa---gevak.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb62a0ef05---37581352846.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910110802158397.pdfIn PDF document text
    • https://udruga-invalida.hr/files/62156207872.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614029ae56b62---rujebolavibo.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d18a361eda8b7a61023f1a162a497516/welun.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/67317094255.pdfIn PDF document text
    • http://afslab.asia/upload/files/rerapefa.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/jefubusikisisugusega.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614485c07766b---88330370101.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210905115205.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/12299986420.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/texefubaburobokofujuna.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109170752245114.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/68144526938.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/84810444447.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/87246623477.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/munekopimetifa.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/79869028432.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/67984026981.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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 18176 bytes
SHA-256: 8152a1581287ab5fb33a39f321ddccd2b34f9552cd3f433bf129af6211739e46
font_01_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F57 10308 bytes
SHA-256: b17542870a20ed0e443c9cf5751d73d9a09edc586a439cc2eef449449ae10796

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