Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc88fe2cf721b02…

MALICIOUS

PDF

115.2 KB Created: 2021-07-29 22:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b4e6907e56b62b5cde971457c30b7749 SHA-1: 6a7fb68165d2744340e22d4d6124fb9b9872229b SHA-256: bbc88fe2cf721b02ad1cb44a5793ca7d43e59eba6c5409c2faa60f6c22f9abae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to domains identified as disposable or potentially compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to external sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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 http://kibbkw.com/uploads/file/98206936917.pdf In PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/a7019d4bd765d1fa6e877c8734985510/xawatef.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e9cdd63f---zoluw.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/68232981113.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/67853217948.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/tiketubobitegeke.pdfIn PDF document text
    • https://btegypt.comfile/pagasek.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/cddfd868bdd502c4c868d03d1ceca0e2/fixolufapeguselewunejik.pdfIn PDF document text
    • http://sung1.com/upload/files/33787440285.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10959211243.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/kt50ei25kp3qgg4c7pjd3j3juh/vefefalevazabidos.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4191f5e1844ed84bb48e06ddce3b434d/danigifi.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079b084474f0---xasotaxopa.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/rejiv.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/woxevivojas.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/8pjb6gfju6be38nienj11cn4e4/6959590757.pdfIn PDF document text
    • http://e-sportis.com/images/upload/fawenolibabanikeku.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/13522bef045396e1b30e04764469e3b3/gulelu.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/11624589590.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/fujemazipiwoz.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/jadazugijedatogadumogor.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e26360cff---71385414090.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/ee2c173d940ed17789cbd6e13dde8204/kimerugiporulivatu.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4feb90dee2---38565484246.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/3569182499.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/krse2b34vubg5shp1ofs8u9ma2/83080789946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=army+drill+sergeant+mos+identifierPDF 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_off000162a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162A6 16756 bytes
SHA-256: 8c8a87aa356f687954b2a4309781322ce94e634e044191c0eb869983f9e98144
font_01_sfnt_off00018e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E51 10792 bytes
SHA-256: 9c80cadfc19fb8d37fa6b05e637b3fd3ca2b45316ff601fca21be0978ce17387
font_02_sfnt_off0001a6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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