Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9ada6363c05563…

MALICIOUS

PDF

115.0 KB Created: 2021-06-08 20:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1fab85b9448ce0d8306f27e8f487228a SHA-1: a283b8305fa7c497565dad04e82aa4957b1b6087 SHA-256: 5b9ada6363c05563fb499ca2c6b7e2e25cce05f14b8e910d92dea757afe79d29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting it is part of a link farm designed to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=pes+2021+lite+mobile PDF link annotation
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa37ca1650---vepubon.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/35277168970.pdfIn PDF document text
    • http://sukhabalka.com/files/file/58746127472.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ac109f0bafc---5514830699.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13540c706---95175629265.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/euaroslpvnlqcmhq4h5kaju0b7/sobefemimexidob.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/c2f53c61616f69a0863852ad4507bb0b/fitonokajuresukonezesaz.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6aa72e075---58735681718.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/vewijixejunegoga.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e61236954---sibamakupexuvixin.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/utb7v6892jjhteegfm2m95bjd4/sabuwiremotu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607595b0c31cc---lodurepebesawodug.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/vrqdte34lqrqgrfo937mat7kq2/10220517989.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/janujisatabotaxefive.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/doxikudivurijutajijus.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e1d1c4e5f0c90689afb3acfd9b13dd63/xosegibojinesureligif.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160beff26eb79f---vodaxodudinu.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2a72efe7---23402777201.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014f13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14F13 9756 bytes
SHA-256: d7d16cefa46f47ff7d1638480620216e20fc78a6c79fe90f1e8b11f99b486e3d
stream_007_off00019d4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19D4B 19884 bytes
SHA-256: 18b76f823d22c6ca8a777785b927f64aff1b324da1344f0336c91f84a0836009
font_00_sfnt_off00012c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5A 5124 bytes
SHA-256: f657c8423eeeba0d10905f3d73ed056fa60ee4cf98127bcedb7f913d1ae2907e
font_01_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 4992 bytes
SHA-256: fe7199f6e4ee3a3c817c9cce79f17c8cae61486f5a310b005ff75e86c2a5a551
font_03_sfnt_off00016a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A64 18616 bytes
SHA-256: a9f6af3845a8b24b9b3fb0c465109ffbc06e480eea663acadf93ee299d6f55a4