Malicious PDF — malware analysis report

Static analysis result for SHA-256 f812eebb6bcb504c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 02:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 66831caf7d23c65b67991421fe5af1a9 SHA-1: d431693c007d9873c445bf7170ddc7c1ef45d3b2 SHA-256: f812eebb6bcb504cb0dadada1556eafceb7c84ae04c7605f00dc768be126c771
124 Risk Score

Malware Insights

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

The file was detected as a PDF phishing trojan by ClamAV. Static analysis revealed numerous URLs embedded within the document, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://synerhu.ru/uplcv?utm_term=electrical+distribution+engineering+pdf PDF link annotation
    • http://madmojo.com/fckupload/file/tazoletigafozowijuf.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/23644940967.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/f650d52016e61752549ff2a798ffc881/xasofoxexoxorawalikajedu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/koraninotogu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093e0300642a---lipobevazas.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/xunefuzepisukewolomibo.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/44443674550.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/pakugadopefut.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c910fb96a0---75362770217.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/eue88lbrl88268639jjkn4uis0/49385611200.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f1b5319618b233a7a64ba0e20ba5e9f9/goduxaze.pdfIn PDF document text
    • http://gapp.fr/medias/files/63072384784.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j5g7u8r21maualvnml99hh65rq/jivukodadibuxipadazuto.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63c37ba3b---7081357927.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/31bfae726cd0f3958eaba116e83fcf83/murupuvoj.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed61425d3---75869371106.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5d03d114---xawotuxej.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607f191216a59---69595618350.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/kobotidivijowuvuzuxe.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210730165922397.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/vekanijisenukuduz.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ollfqnk4f1fbri9aoapqhmeb90/76107033632.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/pufidefosotaloza.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62D 17356 bytes
SHA-256: 3ae3515a92f178498648c061403670aa4b86aa88aabd47cd156d5eeeab58673f
font_01_sfnt_off0001034a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034A 11016 bytes
SHA-256: 3606817a54f625b209264e91824fb3d0f9c6ef4092c021a4e5f029a212775470