Malicious PDF — malware analysis report

Static analysis result for SHA-256 59423cea4a2aec02…

MALICIOUS

PDF

92.3 KB Created: 2021-07-19 03:30:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 48d7cdc4f0cf5b4845a427c64e9ec3a0 SHA-1: f202b65eca4fbef9ac34208111db28d8317792d1 SHA-256: 59423cea4a2aec022aa7089a050b6c613568b7683c7bd63e89d6ac00640ddb1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting it's used to distribute further malicious content. The presence of multiple links to potentially compromised CMS upload storage indicates a pattern of exploiting web application vulnerabilities for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d7135e8f---40405415363.pdf In PDF document text
    • http://apcmagon.com/userfiles/8518686423.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/toxovifujora.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a0c02e806bc4593d1c70c905effdb4c0/18274670578.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/89502070243.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/mefagopesave.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e9469f2f9---34887482444.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/67529600462.pdfIn PDF document text
    • https://menu2uplus.com/images/file/23262291048.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096698313182---vapixuzugazotetepij.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/9440883857.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/c988e7e90632961afd94d00a0fc09c0b/4314224314.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/telumozufakor.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b047150e53e---vexuvibixubipagotenipupog.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e8946bdb29---faxapokemoz.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/33054489199.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/63751210914.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba446d5e4de---vamogutijolos.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/mowoduxoxozilapefun.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/sebikedagurafojumopunem.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/ralixilejitit.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078489145d47---51823849261.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3433fd8ecd---tozom.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/v8gduqp1k1hi0ctoseq32e8691/losifi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab401db923f---72435144501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=why+are+you+the+best+person+for+this+job+answersPDF 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_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 17896 bytes
SHA-256: 5c8dfd1f0883c5877cb100b977f13e3c1b0949f82f21bcb428878cf045026028
font_01_sfnt_off0001303b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 10972 bytes
SHA-256: 3976f8e412da3a8d13e40ec175e9cf073e4a34374ee10bbb6d01332f3b4b9bba
font_02_sfnt_off00014978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1