Malicious PDF — malware analysis report

Static analysis result for SHA-256 4789def51a59084a…

MALICIOUS

PDF

69.1 KB Created: 2021-10-02 11:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 27d0c3ca28140fa8458d0cb2e2e2a3a4 SHA-1: c455bdb4e1df4c202585844e9f02e2a82e700828 SHA-256: 4789def51a59084a9447d480d0e8cf24f133c9dcfaffaa0aca323a909a217a51
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata from wkhtmltopdf, and the presence of embedded URLs further supports the attack pattern of luring users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.polni.si/Images/files/91065924633.pdf In PDF document text
    • http://antichigelsi.it/userfiles/files/73839015570.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/milutelaloro.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/lifaxavetinifixu.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/zubonukokufopavogulav.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/nusofixiwenenisivefok.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/68a333a7aedf19fad3bc1e6beec15a46/51813780926.pdfIn PDF document text
    • http://citranco.com/users/files/tajunatiwu.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/10356951496.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/bunexuvodimidu.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/85420115237.pdfIn PDF document text
    • https://orrizon.ru/images/file/3123348091.pdfIn PDF document text
    • https://ferropula.hr/files/vurekukifomesaguxajerebul.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/84208249636.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/53671571225.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161468c8b6087d---tovizuredovepopimepud.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/70907376873.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/88709805232.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/bedb57fb5e97f656bf36f47972701e96/58373944074.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202109121424202396.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/midipite.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/zabutunosofez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=answering+the+phone+at+workPDF 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_off0000ae2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE2C 10644 bytes
SHA-256: 50e175deb574d1c926b0c1d0da70e779e7b3f0c14fbd93968a3441aa42761ebb
font_01_sfnt_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 15796 bytes
SHA-256: d6aae587c24069eff3ed276c47202af5faa67c436ba262ea51583ae5d62aeb46
font_02_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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