Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d945e772a5b4e3a…

MALICIOUS

PDF

86.5 KB Created: 2021-09-05 17:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: add0cba7f407dc8ec884680d11255f2e SHA-1: e796316f33a4f4ebc4e1ad9efa58aa457329a6d9 SHA-256: 1d945e772a5b4e3a4ed3d62623bb919edca653a77e750d66b8e8ee2e932516de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs indicate a likely spearphishing attachment used to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=graphic+novel+blank+template+pdf PDF link annotation
    • http://nacyc.jp/Upload/file/jugalafetuti.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/8400097126.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1925456930---80750888178.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a7859c21e948e5776c15df00b308f2d5/bivekupof.pdfIn PDF document text
    • https://777mto.com/contents/files/54404037756.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/60107778280.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6723e75d---xomemawofijawojokeme.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/kobagepujin.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1bbe6c25---80202145769.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704e94acede---gosotixokulelixovur.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/8f424f73455cf19241f4040732db3910/fegagev.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/3e0a31dfda144ee69cbef07f07c267da/90076236514.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/gedoxetugajogoxurigadide.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/dukofofuxedofa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608475f545680---lakazuvelulifevudunu.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4bd1c3c0b8db70925930af532f14636a/10069086351.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/gekoki.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/6576465290.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bowukunalemolesukorez.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/krlk5mu719qgs70o0a02rcummc/vimozugudade.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108110341201438.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d728f954752---redudep.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/gukupaxowelikedoruj.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_off0000ecd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 11056 bytes
SHA-256: 4b9e655f333f22f02fcd0f30d474f9db508118a5127b1a6e9bf3410e3eff4bbc
font_02_sfnt_off00011e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E45 17668 bytes
SHA-256: eef509f717ed043a2cbafda3d8b46c76c20905bf4c2465bd048d0649ac639d8d

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