Malicious PDF — malware analysis report

Static analysis result for SHA-256 20489065763041b8…

MALICIOUS

PDF

93.3 KB Created: 2021-08-14 23:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a84c21efd076ff2d1d09bf4ac25baa98 SHA-1: 05e424025ebe275f2e592c5d2e6c8dcdf7a17af1 SHA-256: 20489065763041b8158fc645faa3a0d1dfc0bb98311a98ce42b4a7469fa1a641
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS upload storage or disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://studiodrago.eu/userfiles/files/nutasatabuparar.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ad96e09bb---paseseripodajoveje.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8844a994bf---xizomewanodemufiveb.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/kamofakedixu.pdfIn PDF document text
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/93480586376.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe4a318bb1---42072604536.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/modepulugejotepegefetir.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/zinatibibaxarudesab.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/76301278269.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b067b294f7b---14930114922.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5ee828d48ac0b43252f6180cb7af0ce8/57749948551.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada810722f3---65854092388.pdfIn PDF document text
    • http://esteel.my/userfiles/file/53745973414.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/79927362287.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/79119475495.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/80457680560.pdfIn PDF document text
    • http://cardion.dk/gfx/fckimages/file/89912498233.pdfIn PDF document text
    • http://stevis.cz/files/file/56261014009.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/38431b9443ea2db9eb33bb3116226573/begus.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afa7a625e1---pobiduxi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/84426872502.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160771d696a535---78239254704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=scott+pilgrim+vs+the+world+netflix+nederlandPDF 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_off0001049d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049D 11396 bytes
SHA-256: f43c7db0032ac408840c02c7c95ee05f50fb7fc1a930b1b0e2cc36c5904b62ea
font_01_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 18452 bytes
SHA-256: b54a56048714789d98a27744a656be80c158192504b42ca59e904ce30650bf69
font_02_sfnt_off00014e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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