Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf8bf976d4952e4…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 00:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d81b7fe8a0acdbcc638ffefd5d0fcdc SHA-1: 36614f43f685059c597b885bc22fa7e07a5da0eb SHA-256: ccf8bf976d4952e42b250183f2b23d5028d9b90189e535d62dd22697a8eae91c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that uses a payment receipt lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of 'airtel payment receipt' in an extracted URL. Multiple heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, suggesting it's designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for malicious redirection or exploitation.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b8988da1ac2f0badd03c952dff57d2af/birozifukunemewerul.pdf In PDF document text
    • http://vkts.se/userfiles/file/329350886.pdfIn PDF document text
    • https://latework.cz/soubory/fudazogezu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a79ccc0029b---52754189992.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1627367911.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/widupatisakaparofobikis.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/96849054156.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/risowudujojurixotuxoji.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/23032217060.pdfIn PDF document text
    • http://vswet.ru/f/xizejagepijunoreted.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f72036e7ba8---siresevaforedum.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6af345dfqhmnf1dtd1uh9nbpnt/15295616066.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2410930qkkp8rokatgtvdolj8f/fulavelujajarizetubedek.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/gimamudikor.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa36e09ceb---saralavadokebula.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/nazori.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/bawebabewiviraputeparole.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vipa3c8slka520min38g4evht7/sagomimowoxoleguwadutovew.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/aq4cdutq2kjol1lqnjd67lgjpu/datis.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/227baf008afe493fd8a05acf4ab1884e/67591769313.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/27809957961.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/budutanigekejumugi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f812f7a0b5c202edb73dcd290e66d98f/24564141800.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee42af0648---duvituwefi.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/tafipoxokewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=airtel+payment+receipt+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_off0000c377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC377 10588 bytes
SHA-256: 5a7aa12e93aa469c22bf367592c26c06196b7d093392d3debf3b8b82183d2f65
font_01_sfnt_off0000db9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9E 15572 bytes
SHA-256: 6340b5bca7ddb2be117d799dd40313d062af6ad9643ac34648bce8ced91a0f79
font_02_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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