Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb688d5a7c6ad375…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 00:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 67c5ac5069e18a0bc2528177ca39b5ef SHA-1: 1bf8187584288e0a919ae136e7570d890dce394c SHA-256: bb688d5a7c6ad3753b1b783c3cc3809894792b8816cd935cadc6f0fd13bec320
156 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 identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ef40623f---limusorizafe.pdf In PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gk0conp7a8b7a5t1tj9hhcg8at/9710837828.pdfIn PDF document text
    • https://medius.sk/userfiles/file/44141839674.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/filozamukorujufowosudiw.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/51060009874.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/gr86subglvha9a96c3nfp0ucsp/30781848276.pdfIn PDF document text
    • https://etimes.mn/uploads/files/228482765.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/68672992405.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612e705273b05---gakujovogetozatof.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb32ab0c992b8da0d936d11a3c99dd37/vositegizakanak.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/sopavugajugu.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fa79134aa32b0ff044e3810794c663af/bisonemes.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/e7ot9aentehjm4heueckgh6vs0/54689152683.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121b435822b7---92003222380.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/sofefebiwakijopipa.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/tufafoduzuvizusiwimilu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uunldogted5m0obnjgcr6qa1ih/luzukuvibaxoxe.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/588ea80ca3ee8dbf351bb6c49ba5a777/torebagijulad.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/bafosuvarugasotokofuvovo.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/duwolopebaniwomupunowaja.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/119fc9f644c2c3cd1c6f9e9fa2582cc1/zirerowuk.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f07fa7f468bafab13fe6e69ee799cc5a/lelumigus.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/divubipakikexuris.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9f8292d3---50423993759.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/6055352300.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/79877301544.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/59436088288.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090795abc873---99949012145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=formation+and+composition+of+soil+organic+matter+pdfPDF 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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 16784 bytes
SHA-256: 3c4f9bca4053eae60f75f064ed21db7ca36566c573f03a9edf78aad548891fa0
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 10940 bytes
SHA-256: 7af2e59f267a208227e254a16d683e52895c85d1f18640b32d11369f11d692a8

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