Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a477fc5bf7af47e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-05 00:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e27802b23c599c67a6959e84d274b3b5 SHA-1: 0445fa96502b4fe97cac62b4d03ab2944cb25fc5 SHA-256: 4a477fc5bf7af47ec9b231775d3f2f557446babb8a1bd3d591cae065da6ec1c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable domains, a common tactic for distributing phishing lures or second-stage malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=epoch+microplate+spectrophotometer+manual PDF link annotation
    • https://arrayamed.com/userfiles/file/tuzifuxik.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d3b33247242cf3f31c7d1395638b6b36/diwelil.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160878a8fcfbd6---wonosuronagiz.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429060514360029.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/lusurixakuzurele.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/vonejejukukotifurunorerin.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/fepabap.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ab7f2aceb97a60838ae7473335f68be9/bipep.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b57c9ae5ab8---37243964650.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tssigt6nglui36qsqk36pfk37k/bolunajezus.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/3s3sano3lod8761lo715jae5ef/pomixokejilovezirikevakod.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/69731103576.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/1d8bfaea288dd3c4a4a85b9b7483de0e/viboridexadulajakimizogok.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/10917398bd9d3b2fc4bd69c598190ee1/30373937005.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/jifosexumu.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/47474529604.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d37cf73ffe5---tunava.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/magixobelo.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/76228006264.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/df4buqmsnv8e2dj8tt4sg8meme/zezukalejivewisezovukeg.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/0mhcd724fso0ak2l0gaoi7kep0/zisutukuz.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jazofemov.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/vuguloxijotomukezigumirin.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee08ccf1fa1---60854043801.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/5661643188.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_off0000c341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC341 17116 bytes
SHA-256: 8931de6ec0696e572e6c7265ca6e75abf6585987283a3960c399cb4aff1ed39c
font_01_sfnt_off0000ef9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9B 10720 bytes
SHA-256: f814be345cf4c079d8e7bd1616dcbbf00c62635c911a72ab4978be26506c872b
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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