Malicious PDF — malware analysis report

Static analysis result for SHA-256 8046508ac2cc5fee…

MALICIOUS

PDF

245.7 KB Created: 2021-08-21 11:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2793173450139062214078f8633deee0 SHA-1: 8f75340cb87a86be662fc9b2ad09ade2e556619e SHA-256: 8046508ac2cc5fee10c19417f2a6629225d0591621fb2c5f6c649cbe65adc186
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised websites, likely intended to trick users into downloading further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the detection of a phishing/trojan component strongly suggest a malicious intent to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7804

Heuristics 5

  • 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.
  • 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://abwcrainhwy.com/uploads/files/korapedonejapenenezitibim.pdf In PDF document text
    • https://najlepsze-w-polsce.pl/uploads/gokon.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efed0d956d---maronavakeva.pdfIn PDF document text
    • http://askort.pl/Upload/file/97426764379.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/b8osl6ecmnvqipk5edkic30oh1/72694691006.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__60CE552F4D3CE.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/c5312eb2f3cd77eb0bb841aa60210596/vatopepijomi.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/zufejukewumim.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/kisolanojotoviduduzewipu.pdfIn PDF document text
    • http://unsersohn.com/images/file/puzotan.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/6844003096.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/merome.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/60199135697.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/43341464280.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610951e8136a1---8958862155.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/xidajufazesenirod.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/ludolokix.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/semevimemurubi.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/veveberuxubeg.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ab959623783---dosonowomiwunewineletujuw.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/s065sof2dnungi36a53hklmadn/mitiludaperunibegagolison.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ed5721f4a21a378462976d1030f2eab7/5193320220.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611468c0e77c6---84175066244.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/zusowoxafasawopena.pdfIn PDF document text
    • http://jinruily.com/UploadFile/file/20210723223716320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ejercicios+de+equilibrio+rotacional+resueltos+fisicaPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00033900.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33900 17892 bytes
SHA-256: 34662db5050cfc48ba2f706ca1353c6f37e59b99a2aa29b3c49cfd471c7ef5af
font_00_sfnt_off000320ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x320EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0003550c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3550C 33300 bytes
SHA-256: 83b917d3d0585cfe18d7ccb3549e2af111ca4d0c085f1d573442c62d00a4eeac
font_03_sfnt_off0003a25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A25C 10968 bytes
SHA-256: efe7554e6d6cdb45f32d3866124d2487a7b7e288151f7253b69a43cd830c1432
font_04_sfnt_off0003bba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3BBA0 1988 bytes
SHA-256: 28fbdabba9553ec933443a248142a58d27859a5a773cd1d1a9a71b5526cc7c57