Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc595158fd98a904…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 15:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 06912d9202bae337f295663aa729854c SHA-1: c602684e6c64c4b19c4c7c42a4eba632c22ed6ca SHA-256: cc595158fd98a904d018a34aebf4947f6c8e20fa112a6aeaf376ba04d4a7646a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the document's primary purpose is to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mtmhomeschool.com/mycms/uploadedimages/editorUploadedImages/file/83660495689.pdf In PDF document text
    • http://color-gateway.com/userfiles/file/87574766958.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/24501070074.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/16/54411748928.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/96082193168.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/12913518848.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/6ad099452a04d487b986770ae386ea5a/68016803878.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/52067739434.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///28122524661.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611c43139f35f---63883387842.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/18835359258.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/kiterosusexoko.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c431e44d---korig.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efff9999c9---34384686737.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/17720342826.pdfIn PDF document text
    • http://www.520amis.com/upload/files/jawesole.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/cdcd4b082c0d3507996763a097de8154/52819213574.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/62724693412.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/kukezovogunuwupi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b710d556ae2---xoresokagawepevexufado.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31b5b144---zipasetupuf.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb43d8d0a7---pogoxoberoninedur.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/50574519053.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/popuwirulufeten.pdfIn PDF document text
    • http://phunhai.net/upload/files/90377506937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=check+font+in+pdf+filePDF 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_off0000e047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE047 18264 bytes
SHA-256: 9169e56bbe0a2cd971632c4af6e43a98a30d462261c4cd7171636a80a02163e2
font_01_sfnt_off00010f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 10408 bytes
SHA-256: 5dec2aa476a9466267285bf76daf005e00f53bf9c5af0a4a42d88b1ab932cafa

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