Malicious PDF — malware analysis report

Static analysis result for SHA-256 719f4fee2b220109…

MALICIOUS

PDF

88.6 KB Created: 2021-06-30 11:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c54ca8ee6489954043a47b33772a78b7 SHA-1: 512e09b90be9ed653f2e6ed2863a62cdeda6dbc0 SHA-256: 719f4fee2b220109b76c2b7d0b82247cb6a24cb91c020e6c1736f01beafc6730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. These links are likely used to obscure the final malicious destination and evade detection, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082453f6b124---xerezeluxaguvomojakepuv.pdf In PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7712f20ab---kizog.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f891804744---21331930812.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/16826787544.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/10843377232.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210519181137673586327.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/990f7f3b27feb669d1f025d8e5321fc1/bigabazefejofotajeted.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/de7c235c17fefefd887d5fcae6be648f/kawonipinavesipazaxez.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fa4e95bee---82341352190.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160858ae1786ca---51341079597.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408cc38641---20610592018.pdfIn PDF document text
    • http://dancingstarsgreenwich.net/clients/1/10/10f73e4104fe6082999c9b722aa65ba2/File/49288647416.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/efbl8qceqdp7i86291f5lvrnd0/2837658018.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/43266882306.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/nebipafovuroganebavogup.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf4697b13---mupekiwazogunigidonixekix.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/pedubidamumugeseriretojux.pdfIn PDF document text
    • https://efnnma.org/files/file/mivixomototepabajepisu.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/53629094272.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/vaxipimoxazipoxiber.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/kefibunikajorenu.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/lakejibiluxanowabujujet.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/lopukerej.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bda1e88e21d---21922649212.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ijgnflgha8tv5uohldd71c4mcs/lajoxipakizev.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cgs1q0ghf6taeerc840hrbivu3/30131127130.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/43775636229.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=humid+basement+in+summerPDF 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_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 10476 bytes
SHA-256: e83a6a5a32d076174130971fb8b6be87d25fac06362c601defc5ad04061a7a1a
font_02_sfnt_off0001280d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280D 16576 bytes
SHA-256: 0c27710f510c73e3764bd8fe5329a1e260a1442fb7ef70856383418cf39657d0