Malicious PDF — malware analysis report

Static analysis result for SHA-256 564ce5fe70883ca6…

MALICIOUS

PDF

91.0 KB Created: 2021-07-06 04:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2f3ed9f32cdc1b00823299eedae9b52 SHA-1: 454e4f25b06b780747a3e1c16edefa1b14c176b7 SHA-256: 564ce5fe70883ca6124ce649fc565d7b7fccb6e7e6187017d21d65e20443ee10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm on compromised CMS uploads, suggesting it aims to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b4725a84f---latukefevemobunora.pdf In PDF document text
    • https://annjulieskarpmo.com/userfiles/file/56649846549.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/devaga.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/f085fbbdb3979abce4a6f23af473662b/52066630519.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d00a08dcf---xexezigodebokopodokoguluz.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/760c4c0241cc865bde7ec385815cb6f1/jinadezoxev.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbbcd7b6c3---82545160864.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e16ca5fac4ee6de44a5ba3f6cb7af1f9/nujegusi.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c6828134a---24256538108.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b77694ca8---78140506694.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/zotofivomujaxuxoxejut.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210613175703.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/tivukazomilaxevajo.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/firefolo.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/753511ef2d8b268178c6557458fded9a/satizip.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5af96aca154c764cbdd010cc249b7f33/21899571182.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/pisifuregujevuvemirolef.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/p6qoqf0oh6j4dc7nh7pb8i36u1/58369279574.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/28moo10cndl53jotg5sb5n130d/31332209136.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/titazaripom.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f750c1ad---37698616389.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/42522985575.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kotonixedelidikujib.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c26209816754521f5b4e802086b9eeb5/43065869425.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/vududipisubukeleneje.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed631dc36e4a19319d59d8878eecdfb9/27779470856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+hobbit+fanfiction+watching+the+moviePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 10724 bytes
SHA-256: 20713a93e434aac80c957ff0f5fcd434127519cef9efc27cf1647d6950182b7e
font_01_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 17128 bytes
SHA-256: 6a1ebdf57737176b4404f7cea0b877c0d24397ff2be29d54493e519d31950847
font_02_sfnt_off0001465f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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