Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f468b5c5a2b420…

MALICIOUS

PDF

84.5 KB Created: 2021-08-01 16:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b44d7cdf1fa0049a3b2d99bf568f06a0 SHA-1: c2b48737a6a1466715778a06e2a948848eebd38a SHA-256: d6f468b5c5a2b42026a6eade6997aef703175b6d40e52edbeb140f57928d42e3
154 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a PDF vulnerability to execute code. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS platforms. These links are likely used to redirect users to phishing pages or further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 5

  • 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
  • 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://philabc.ru/uplcv?utm_term=why+is+my+cuisinart+coffee+maker+leaking+water+from+the+bottom PDF link annotation
    • http://polipack.ru/content/file/wemapa.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/4256815e75b694f457d5ed30ab4811ca/weziridex.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/tozujadibure.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16072583b74670---44254452859.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/kamanalapuwologamos.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/67074496374.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/98912182541.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a260bb738a8---35487147630.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da917935b5---71478326371.pdfIn PDF document text
    • http://rideco.hu/upload/file/31183070538.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ee18e1e2c3621be6e88f341ec5802db4/pirovimavamutukigiw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160843edb1789a---libebiwipuparewovupabe.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fdd3b7d5f613d2ef3680137e21260286/dujudozegafuj.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/50389962333.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e16bdd4c0---11893873709.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/89156686042.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71693203286.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/juwofemirawoguxol.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d55a65b38167e67cbbe0049ae92a2bf1/fubigas.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfd7e8e98---37368956589.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/befuresorosipomiridifad.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c04a7c183---puneripasi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1b25b55ea93a423e682c1d02014cbc5f/surimewilososevol.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/tavijipijuboterefigeludo.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608214c9d7295---32568214720.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/sowidet.pdfIn 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_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 11308 bytes
SHA-256: 56901dba74e49329ca71e90faae937ce5f71af311363e943432240a23ec2677c
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 17488 bytes
SHA-256: bb18baaa6c464e7efb22989e92f67e87db14c94bb8e9d7b8ec93c974c0d7e96b
font_02_sfnt_off00013d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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