Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4d28b881eb6876…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 05:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5b9289845e71a214c42740b17ff0fe8e SHA-1: cbf9d46c791c32c82121d2ecb5514d4c915923da SHA-256: ad4d28b881eb6876636648d0caf2d1d49023cf7424b2651216e8a6436f3e2443
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm points towards an attempt to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://allytemp.ru/uplcv?utm_term=rice+and+carbohydrates PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1f1929b15---63737961660.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d31d4fdc6998647ec075bd7582159653/walawiwazesonifan.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/vupererewatosiz.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/081700266208.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/bokinoxowerujirisoravug.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/498612abedf6f8e5ec7344eac51f664f/92358677904.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb7e2109bf---paxasugavonuxupip.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0644a255a---dibidajotopalavulex.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210829_214858.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/64410300407.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/vuwigitejukotana.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/63446971935.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/hbnvfb4m8ud16goqqm8v0qqvv2/86242531330.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/xusomitexisem.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/fezajitiparudipamet.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdcf17213b---2783582192.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/padujigogebijarelisaduw.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/ca72ca0b5a9768b3190d09dec916f766/97645558659.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160749b0b87987---gisegidev.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/56318978048.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/vhp4tc9u5bm1ed3ftk56devjo3/ritapamimizunolewitu.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/boxipobezotu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce831b1aa37---rejuxifamuzik.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/rhdfg0pqfmql1qumn4gf2m51f0/telim.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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 10720 bytes
SHA-256: 9c065e7ef1c49f1784d1f73cb79861d8332044a01f3e657647ee2271e4da8dc2
font_01_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 17280 bytes
SHA-256: 94e0c6b442f3144fe76c95c5cc2befe753ea8aa30cf6c6d6c9f2472d1066c96b
font_02_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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