Malicious PDF — malware analysis report

Static analysis result for SHA-256 568338a8583c0855…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 20:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 92882304cf48ae21d7999aa5822f2c35 SHA-1: 7e17cbcfd96e5574a96f326579c4aece47d6d95f SHA-256: 568338a8583c0855195142b2d509aad7f28fb2c445abc6bda72cb6d8a1068a1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/genirejavowutu.pdf In PDF document text
    • http://uctodane.cz/UserFiles/File/detifilaz.pdfIn PDF document text
    • https://bachson.net/upload/file/nepolasigewapirasisam.pdfIn PDF document text
    • http://tzsunup.com/upload/37465112738.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/74350631595.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/jabusizamepajipugi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5573429c0---buweli.pdfIn PDF document text
    • http://gdgom.com/upload/file/210621065218922892rf8iog9bs2fg.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/667fd70c8272b085b8d20b89792731c0/fonikerutigi.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/kulix.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c1638c2f41351cb57d85ed6d4f02cfbf/bezijopusupubapaf.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/nokebisuwizafugesav.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612062de2a040---vewem.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/misabufivab.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/pofawikebusoluruni.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/penodabexanibebevi.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/95194887399.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/824737096dce43e11e179475b706ee0b/88342022795.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tebebefudo.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/43770737436.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/pesopokefovofaleturubuxil.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/25187319281.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/figikivesuvazamer.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/chkga4h865nreon3kaudnv2v86/11575210544.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/lupemotubimekojagez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=generac+pressure+washer+manualPDF 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_off0000e3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B2 10552 bytes
SHA-256: ecb09ab2afe08c4421ca92ad5d9b234d7e69ac2ed467a6ef5e95ad99cc82d3ce
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 17652 bytes
SHA-256: 449f25512820f211cedd6b1a8096a12e52c0fb2f369e84b82dbcfc46c317cc5e
font_02_sfnt_off0001296a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1