Malicious PDF — malware analysis report

Static analysis result for SHA-256 3985296e19b95bdd…

MALICIOUS

PDF

97.8 KB Created: 2021-07-08 22:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd51d05c7659e318cb34a4a2e7c12dbc SHA-1: dd66a8a6780123247a4075048edd8331994b0f91 SHA-256: 3985296e19b95bddf1ce0c5dab21e9f1cd4039d252cec3ceb4d18f3b6e70d3c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious documents. It also contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dba74e122b---zubalir.pdf In PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/48338804edaa10d7a1e84f8daba52283/pokiloj.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b75cbda4---1915410793.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a49c687aed5ceb929862e373ddf57e57/dubigubirikadejenimopu.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1bfcbfbf2---relomuzaberesozejunibo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0cffb1258---11700587614.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xiladejoxigolaxu.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8pju7ausvtau8c0bg8h6vop3u1/53386647751.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data//files/nozuzok.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2fdc4da77---21995991374.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/fuvigoloxenavozivejeguw.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/9163988960.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f62513243e741318366570e5963f2eda/51513516295.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/d0331596f967422c28bbede508cefdef/98785899449.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/09c191245b303c082503afe0469d1e05/73106270519.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/viranofutopipap.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/99297012201.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/24e2c3bf0d9d8c198f3b487bd1600c67/kigiv.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rma6ip8qeo3v4dh7aj29pld4f0/83318449005.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8c1310505---73735049270.pdfIn PDF document text
    • http://classtool.info/upload/files/40552640923.pdfIn PDF document text
    • http://mahkotacare.com/tmr/userfiles/files/kobejejexok.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/49069101180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=a+rainy+day+in+new+york+endingPDF 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_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 10384 bytes
SHA-256: 778d9b2c56af2167e3386eb1ae52c6a387230c816c6a0dad66c8412f3bdc054b
font_01_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0D 18304 bytes
SHA-256: 2f709bfce214b4adea86fff0874c453b6e555d47c2617a4c8d83037a239efa39

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