Malicious PDF — malware analysis report

Static analysis result for SHA-256 2530680f76bf3cb3…

MALICIOUS

PDF

91.0 KB Created: 2021-07-25 12:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73eea2171a59fad1c6203274841fa651 SHA-1: bce438cccd7369ff73961caa9f5775185500bf72 SHA-256: 2530680f76bf3cb3867534ed762dd2af44485b0ace7e63f1713428fcd23c2036
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS uploads, indicating it's designed to host and distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/191dfe32b9cc35db92fc41ef5a60cae5/veziturarumigovilaloziwo.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/15363c50655011ef267bb25fe8474c0c/63819617940.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/v742kda0qgkcpedd9v5crqbfq8/85056621190.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/limin.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e3610e5d---vumef.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/zanolidifipamudosuxowogax.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d93c0cdbc---wipuzuxabenobesiwa.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd60c9e15---91771738275.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4c546839d8cec45029450499240b2366/16622885631.pdfIn PDF document text
    • https://activepymes.com/pub/file/suzifulifozevoworok.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6dcc4b3ce---jajadog.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16099765d559d5---2694969554.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac49746941---19237317529.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091189c67582---teturema.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/0uouq8tie6puuh4m06fdpla7g5/xotufidadurutadipok.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf0bc7d319---27450273165.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/95920795317.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082829958306---subewibomolug.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/64826918891.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/34945928048.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084e790d907c---94363719787.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/93329464028.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sj0sqpmmuj5oa9p7atofmppu57/38838949815.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/sivojasavejam.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb17cd0397---12105940573.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/5e02468f8f0d542d376f70bc774d4e8a/77048204596.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a086afd72---kobosokabomukifodatijuraw.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/84860549547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=concepto+de+relaciones+p%C3%BAblicas+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_off0000fb16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 18372 bytes
SHA-256: 89eeb9496fa530091d6f2accc4b5364ddb4e4a69027617c99299c2790f920801
font_02_sfnt_off000141f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F7 10900 bytes
SHA-256: 70320cb249ca53519430cd35fa41ef82b5cc2ceab8544ab5ab24dbb1faab600c