Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54a32a7bdb74dae…

MALICIOUS

PDF

84.3 KB Created: 2021-09-19 07:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 568cf5411111d51d3783ac037aa8a37f SHA-1: edc35da7336e450e0949e4a5695a5125afd007b4 SHA-256: a54a32a7bdb74dae0d7a3e44cd70a24a049b8848989692401387620a2afac181
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://cructi.ru/uplcv?utm_term=stories+love+and+choices+mod+apk+unlimited+everything PDF link annotation
    • https://tradingphrases.net/userfiles/files/9527681581.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/49635273303.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/72743002475.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/4332563177.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109181601307464.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/97021756685.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/40711903985.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/50564858138.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/74629930405.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0c1a97a9f---xamokubavenonabesomutefen.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/46200328604.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e22dbd1696---naxuwagama.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/riguduf.pdfIn PDF document text
    • http://dpkwi.org/userfiles/files/jetupidajesurome.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8fed54b73---358712848.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135585e71a0a---52143899643.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7ms4jef1icsangt6lcbs0olfmk/8017821854.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/jakigukib.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161366d8217d63---lawabilamu.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/91267936074.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613daaff8e595---58525578243.pdfIn PDF document text
    • http://ingore.cn/upload/files/luwikadukifinoze.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/tenewip.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/kubugevaxuzas.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/33209714489.pdfIn PDF document text
    • http://devveb.net/userfiles/file/guneturoxanogenusijuj.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72255686862.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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 11408 bytes
SHA-256: 9f5963622560809b3893f15491ae8ba999871576597ea20b2c9bc43c5a771c7d
font_02_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 17780 bytes
SHA-256: 769f584acf23d3d6f59efb3fb0067ca9b089a08507880f1bb55bc44cd9862217