Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b66280a76c5413a…

MALICIOUS

PDF

114.1 KB Created: 2021-07-21 08:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 33455ddf6c3585757499b49dda71905d SHA-1: b4f7ef70af65de016363125af54c75a839aca565 SHA-256: 4b66280a76c5413a3f8749421a52490566d5fc47a718190471eed29f75fdea26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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://masini-de-ambalat.ro/images/userfiles/74019012188.pdf In PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/r9remem2qup0mhhrp3cnu5sc92/padufitupato.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f37efd9ea5b---27853668340.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160e80dfb3f602---mupovibevo.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/691a4c3f5421be63709ee58f95e1682e/lititogewikapedakefazud.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/63997587463.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/pusukusolerebabati.pdfIn PDF document text
    • https://oversaslogistica.it/file/8880911527.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/5792117071.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/lazulasomojijovomexupabib.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/visezudivugagojen.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d868ef93.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/90877652271.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/25144399496.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/wewunopolosot.pdfIn PDF document text
    • https://fasaac.org/temp//files/45635745044.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3603503c24e2899b268b91375ab4e571/26594827183.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/22581917979.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f4a479015e886f72f47d6aa411472d1b/31615821055.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/203cac18e6aa86612f113eb3af3b3fa3/tufazixobomesozesop.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050faa238a---gaxakejumevu.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-17/20210517011002200308.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/edda972efcfbf87e1b62afe87a39605f/14083640616.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/922cb3498d127b82b56ce875072ebe50/zezexutetigudogimev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=league+of+legends+wild+rift+early+access+apk+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E22 11144 bytes
SHA-256: 07f3de84450db2ddf252e9ef2a5aa1598a3a2b6871eb88f5ab5e48cf4cce3dba
font_01_sfnt_off00016825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16825 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_02_sfnt_off00017055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17055 18980 bytes
SHA-256: 00c54824b21d7ccef68b9fe515f4441b8700d3490718a338782df4e4bc37b971
font_03_sfnt_off0001a048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A048 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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