Malicious PDF — malware analysis report

Static analysis result for SHA-256 481b76205cfc3921…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 21:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eeac79777b7c4717a91d5db51e138c9b SHA-1: 6716ba92b1c580eb9a7c77bfc224ff565a1c78e8 SHA-256: 481b76205cfc3921d04956f6566431c39b6a2c1f4edaff3246751df5b1c5f2c7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may contain instructions for accessing a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://inwebjor.ru/uplcv?utm_term=8+ball+pool+free+rewards+today PDF link annotation
    • http://pharmorgsyn.com/upload/files/24416838484.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/34378956971.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/nigejonuxigara.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3bf8cfac3---mubulexofi.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58079810091.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141c8468db2c---76500454943.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161425e87748b9---54979664990.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/samasak.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301a1687a3e---rarumikimo.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210906133117_w5gsf9.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/45124809123.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/jatuxat.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210904191806.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613145c07d648---wefijedadodezutulipupug.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/tibawiduvoburisog.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ffa83fe0d---xabujiminuberoz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dcc0c5df7---55031986766.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/ca0ad639d28c6665d7c02bcea83d095c/vuzikumosim.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/dixoki.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/kiwanawul.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/kujalukufowofodavusome.pdfIn PDF document text
    • http://ruihuitax.com/files/file/sanif.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/fenudizageti.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/88520ac600fa5c3134bebaf75fdf0d0b/kidumapubijezaw.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/nekaki.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_off0000b44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 10748 bytes
SHA-256: 8a476ebaba8f01c6bd9d98d2182fa6213635da52c9be8224bcd53de0e45c5b63
font_02_sfnt_off0000e51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 17488 bytes
SHA-256: d861718d0d87c379b6541e22bf7e8ebda9801cbc75ee62c95a6e4046546fdafb

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