Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb21b51d69ddab8…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 01:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b57307e48b0a13f9ff735593effd5c7 SHA-1: d4ebd8f26e9b879c75ceb9f50b6cb811aff5fcd9 SHA-256: 4bb21b51d69ddab8e0cd6f6c1829406a1d769e97c5e6bbe6ce062ebcda122002
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or are part of link farms designed to redirect users. The primary attack pattern appears to be the distribution of malicious links, likely for phishing or malware delivery, leveraging the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://alliance-vietnam.com/upload/files/30749528504.pdf In PDF document text
    • http://teenmag.cz/userfiles/file/laxabebivev.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/2uvbnd2okh4apfgksgqude00jo/81942343793.pdfIn PDF document text
    • http://belst.by/upload/file/20537101540.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38509c7f7---gebajapawezaf.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3a7d7bdbaabaf7dee7b38ee61ea1e6fd/fibawakem.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9fccd93d18e9126c8c657a10af3a7b3c/rexate.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/88950278805.pdfIn PDF document text
    • http://geose.ru/userfiles/file/37439844107.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f66356244ca2ab494dfb6f07c2c3ce8f/40669343660.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/porapomidenipujafoti.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/85887613774.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/wakofug.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/21221096877.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/92025134149.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/0110fde05a77ce8c14d1d876fdf5759c/zusixasunenesudodi.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/95366559631.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/078dafec294a7dfaa9d257074c6a7db3/39631218293.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/katilagibazekafuveguzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=la+bella+e+la+bestia+libro+originale+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_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10768 bytes
SHA-256: 452e7b6fcba4a378fe7d1f3de183e47202c07e9d9a1e12c370ffd35519903671
font_02_sfnt_off0001069d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069D 16804 bytes
SHA-256: fa9ace291dd6b1b392894d06ed98e8c08d19fba6181debd1b7960c02e0f4f611