Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e2e7e2cfc22a41b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-23 07:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 306bdfe3b3d88fcc2f0ef590ad68796a SHA-1: 24863cc8e579e1f79eeba72bba080aec1d244bf3 SHA-256: 7e2e7e2cfc22a41b562a109eb964f82ba936e7c14d4880d4ca431e84b4469243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=watch+buffy+the+vampire+slayer PDF link annotation
    • http://laros.cz/UserFiles/file/27880849906.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/24745176442.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/xasigeditaraxujedagitenev.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/girinexebonujokofeser.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5c9b029f0---witoj.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb15169cf---bapaburaxovatonenetunoz.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/biraforogixonalobafenebog.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/65731067748.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/rudekewajiwaz.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4c36368f---zutafekonipagalafi.pdfIn PDF document text
    • https://esz.jp/img/editor/files/43768211209.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210906050123341.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210912_224654.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614bf9deacea7---gujojowevugej.pdfIn PDF document text
    • http://vhktn.at/images/content/files/muwanutabe.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/76805879843.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/dca14172169b7514442d9c8d233e027d/pizuvoti.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/53149211318.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/vafadajoros.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/jufipinov.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abfff8f9ff---giwubeg.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/tujuziz.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_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 10932 bytes
SHA-256: d32912c715823e0a5edd7340e956cf17a2c19465741a248a5641313f960dc670
font_01_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 19324 bytes
SHA-256: 0dee2fe825faa93eadeeb85ae760bfdacfd808c7511391a6d6d26d8f3d294294
font_02_sfnt_off00012da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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