Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcef0873ec8015e2…

MALICIOUS

PDF

172.9 KB Created: 2021-07-03 19:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9f7d11874f67ccf549cd85857f1969ac SHA-1: 7f2848a3031b5eb73370237d263592263d2df46b SHA-256: dcef0873ec8015e29bb4b066f552626af7b2b2a16497a77674bca32a22688ddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The embedded URLs are likely intended to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

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://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/padozerebu.pdf In PDF document text
    • http://synthecinter.com/userfiles/files/zulagakuzevumilo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/tijobudisasijode.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e12d92d6e0---zutegowefemugulo.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/b20gbeu8foddb6fao9q6iuheq7/lonulunuzokuvanorav.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kibubisedasoru.pdfIn PDF document text
    • http://sunnysidehigh65.com/clients/d/d0/d00d1ad1640c45b888f5e58ac216a5d1/File/50593440665.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4dd078a84---minozarumeboba.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6f019102b8388b36bc9c8fceb6dc3417/wasozuxabarebir.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/pibebafovitufupa.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/67721887458.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/ruregikefokijox.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/bbce7ac6fd2fdc14565e7a5d1bfed5bf/mifitevesamemuxamuto.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b99fb07cf5c---vojulesimonatepimovage.pdfIn PDF document text
    • https://masihpt1.com/contents//files/37602165626.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/258b9ed2a1cb8a5c8b76e97c8fa06f71/3100746758.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/dinumuleradomenitabuko.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/54209399271.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/35824337007.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/21504682972.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94e460d7e8---1626135105.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8tbf9hc2amrul85lmuriurlttd/88464965173.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d5e410b41---sobimatemumivuwebajoxax.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/753fff6e1847fb5d36fee083475dac15/58672364122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=setting+up+fire+tv+recastPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002321c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2321C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00024a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A33 10732 bytes
SHA-256: 489656b1f42b83a5a23ea40299f566d8de8d527e0d1631b36baf9807a2055c00
font_02_sfnt_off00026305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26305 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00027846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27846 17464 bytes
SHA-256: efedcde3ff064a4f6845477f9ea7def8523168219246699912db6c9151f1ab37

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