Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d7638f87ea5fa4…

MALICIOUS

PDF

140.5 KB Created: 2021-08-06 18:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbbcc99f70f381ac7efc7762cab7757f SHA-1: 85f1149c50ad04e8d5243e28a9beb45936220465 SHA-256: c3d7638f87ea5fa49f65e9662589c270370c9a03b15e958129e755ae93a7efd2
176 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document's content is designed to trick the user into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were extracted, the PDF structure and embedded URLs point to a malicious document likely exploiting a vulnerability or serving as a lure for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=notice+chauffe+eau+elm+leblanc+ondea+hydropower PDF link annotation
    • https://tauthuy.vn/upload/files/wodekopumalo.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/zofotemijuko.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4bf1e8c3010af435ad3d3b657f920cc5/ramiteluwu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/874aa274c8289b17a323a34e66542643/38796964700.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/99036278377.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd31a577f---18347109499.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/gjq1orf387aqj437jdg4srs2b2/87415613914.pdfIn PDF document text
    • https://5uempat.com/contents//files/pomedel.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a9581a1ddda---juxenosunerevebube.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6f2cadcb---54097062749.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085fa2ca53d8---kulamapejifelepoda.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160785871c1cef---63347745233.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc4b1cdd7---lidub.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/43599903600.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/1060083110.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a762332e2d26b4bfa173a8402e652aab/jadujilazixovivubame.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/46211581880.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609738af39610---65735401488.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4e681d4e---18731866389.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/50d418741532f331f7b87b73bb97cec8/43559731052.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9cf1ca9542f635baa38cc18fa172128a/lavesedotoweralubi.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/sewawajomise.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/8c2n6vc0f2u17vb3333l7moof2/pipusutanaveminav.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/fuwokolaxufapilis.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/498l72p3crsco2l78tibnj1qat/wepuvopofukaxejiso.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebbaf9ce68---zefiwelarorupugur.pdfIn PDF document text
    • 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_off0001bb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D383 11132 bytes
SHA-256: f5320fd15af4003e79c484aaf45b9c5fde1a50b8e6f9288f718df49a6eee1e89
font_02_sfnt_off0001ed1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED1E 20248 bytes
SHA-256: 7329253e0cfdacf8ec36a9319163e4cffeb43593a132bed041cddb4e1f92cb11

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