Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc558b48edfaaed4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 03:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db9a4640ba0d904b32c90d5bbb6538ee SHA-1: 8c7a3ff780895344b9bd639273a8ff1ac60442fd SHA-256: cc558b48edfaaed476d0b98dc8ed0a16fbe1faf683a7850056a39a39a4ec019b
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://slesnick.net/userfiles/files/90754705345.pdf In PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7938768c1---valagewarowemi.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/77475930311.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/63738218099.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gizuwofinunagasamonezazib.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/getozujurew.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833dc0231fb---12317922607.pdfIn PDF document text
    • https://digireg.pl/upload/25132174947.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/50270357627.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nigugipawoti.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/11720503062.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/bifum.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/mejafafe.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1deb9538d---36768536152.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f96210c0---39608210078.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161053757901ad---sanefop.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/817iv149iccnpl7gfvai9gt3u2/fojosirulofudufosuvo.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d449b3b3c32---90739851408.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b6338e80af2---luxijebivewevibod.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611820252d10e---fepawevonapemonup.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/48239253490.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073624fb2c52---95701481000.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/1f80895d8b27bf1158301f586bc987dc/41291657272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+rock+actorPDF 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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 18912 bytes
SHA-256: e315099bf22f8668b86489e2483af8546c27edabad653bfe4259bc5f7489a9d8
font_01_sfnt_off00010f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12754 9972 bytes
SHA-256: cf5dfa0d82dcec215417918d926435bce581514f87a85a53b1447350f6548418