Malicious PDF — malware analysis report

Static analysis result for SHA-256 defd820d825dcf28…

MALICIOUS

PDF

84.7 KB Created: 2021-08-13 09:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 966bfc6715e57e6d2f7cf825b8712063 SHA-1: e701a050f75b2bd4a6a15a9e45ebefec9b655bb4 SHA-256: defd820d825dcf28fab79ace37ebbce48301343194234ed25a6fede2a757b502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://travelsi.ru/ckfinder/userfiles/files/2782960636.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/082e7emdav3a6i4949v888s30m/79545319414.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/bozis.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8a778fe6---69659828577.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f37e484b4cd---temowesuti.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb60f08064---zuzizojobazusimerubodofi.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/57249051345.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/gerobewupotejesapetoji.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/42806458458.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3731d946a3---22785856546.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/pasovanixiseriwukav.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c9155106cf60db3d532814934941fb00/pifalusal.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea63a67103---xosigemamesikominuwoviduz.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecb9d19ed8---vivejosoketukanuwiver.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/wuwudig.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/64057076445.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160942b735d643---32883199138.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/nidixifelajepulive.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/xobolajujebejegagodimup.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/vuvojimexegovudipesan.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/62497286113.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/29p0u5n3q6umntocudfjcd5fqv/71455800027.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/salejir.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/36206137800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+write+a+formal+resignation+letter+examplePDF 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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 10880 bytes
SHA-256: ee6bb88015edc318388c5e4a606f9c71b39063354ffee5771f137fc1c5b8703d
font_01_sfnt_off000102ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102ED 16348 bytes
SHA-256: 8e964fc54c640be2fa10f4a4137c770d4b78e7f9725f6245ad09eb251bd855b3
font_02_sfnt_off00012d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1