Malicious PDF — malware analysis report

Static analysis result for SHA-256 e070b5a6e3385b01…

MALICIOUS

PDF

83.9 KB Created: 2021-08-01 10:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e52369427373a9df02ab1377e6460e20 SHA-1: 81f159a6476a6a116c8314c5a6f5fdc3a2988a9f SHA-256: e070b5a6e3385b01afbab51184913f40cbb0398632edcea01fdc420ea8fe5a3d
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or credential harvesting campaign. The PDF structure and embedded links are consistent with a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://catamma.ru/uplcv?utm_term=coordinating+conjunction+worksheet+for+grade+8 PDF link annotation
    • http://kripasec.com/userfiles/file/zabepivar.pdfIn PDF document text
    • http://iphysiology.ru/upload/40919191985.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mivafigarezakavexiwegidu.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/34465767189.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/zumukigesoxisinisekavo.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/gelokunus.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/zupusosabupitediz.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/6ma3q14i5dlr5r31ma2tsdpr05/66608775075.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210627125833_1240388246.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd5741a237---tewemuvadukunowiperufo.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/4797474261.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/92212994259.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/43ab9beaa3add87d66091e4162916939/gagenuvofuduk.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/96539960711.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b22f16f2b7e---59389896201.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20949959964.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/46oo49umrsk8la9jm4977eiblk/vewibarizagivexiwu.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/xodeluganubetolirofezusi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbcb027a72---48684573238.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/58344450955.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef15caf28---21215042731.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ae5097b914fe0ef2e7240eec1d265600/mifupe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768f6eca59a---84819078376.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/tawidusivujisijitupe.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC3 16104 bytes
SHA-256: 74d5ff912e5206794c4c5add27155c5ce5cf5e1ff194f0a33f59226646a82e31
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16940 bytes
SHA-256: 67ad75cfb0b02b9ecf7939e09a980b3f11720d90677bc5a885e11b8dbfd38ff0
font_03_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 11356 bytes
SHA-256: 51084c295a1135e5b036f91a36d152de195c38b0e586d4e1f719a6fb6e1528f3

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