Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4203ab9d8bb956…

MALICIOUS

PDF

84.3 KB Created: 2021-08-27 22:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee8b52bb3fc07f88b898baf6db1cc546 SHA-1: 658c0f24b7a0b4b836455170856a8f0e26c7cc2f SHA-256: bc4203ab9d8bb956c5fcbb2f7e65d84b3148cc23ceb830d41a83903d0b97c5c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for further exploitation or phishing. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xn--e1aazeoc7d.xn--p1ai/images/shared/file/33515854772.pdf In PDF document text
    • http://guoyangmoju.com/userfiles/files/sigeroxiwemoxitimamij.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b3fe58906dd---gobemulutiwudozipurifagin.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/cu1bc4hv09kgv3oacrt9nq0uqu/90371117412.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/69848200250.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/78800184004.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68bfc868d---tulexajaluzenebevel.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/8e465fe282f6e3dfe3ad9b1a4a3007ca/38983314408.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a61e269fc7b---76004737557.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/b310b8a0b9gfeph1jgfrs8fe3i/16220074680.pdfIn PDF document text
    • http://skincarebylaura.com/clients/862251/File/lepomanejifizaraz.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d1d64f5a---52864558849.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/34882087531.pdfIn PDF document text
    • http://susanirvine.com/clients/82887/File/rinapodujudopenonipapifa.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc558a6920---nofitidezag.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd65e39553---rezinizimabedoja.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/38428068209.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/98680963791.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/l13fbcbq602dhgf6ccsgnlovg7/zonij.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/xotovafo.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/gesatofirojelibuxa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160774c4a0865c---fesorozevazavazesoza.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210619171414.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091732374c38---74772907777.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/44a738769fd6c81e95a8404106f95658/lozuzutel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=one+month+anniversary+wishes+for+daughterPDF 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_off0000e366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE366 11148 bytes
SHA-256: 0b45341727774058af3f9b9f9ae3178e571ef6260e3e5706ce6a280321c99e40
font_01_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 17612 bytes
SHA-256: 6c09cfff42c2c50b9c45cbf414f69c0d1620d9de8675699a268162af6f19a91b
font_02_sfnt_off00012ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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