Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd67965437093f17…

MALICIOUS

PDF

92.6 KB Created: 2021-09-08 08:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2448c84ae2b9299bad6fdad29f4daaeb SHA-1: c29979e0bfd7094921bb22494d2c627907f05cfe SHA-256: fd67965437093f1727fe3e7385f572031647c3e0ae9f919fba0012660363c5d7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=comprehensive+sexuality+education+pdf PDF link annotation
    • http://fijiembajak.com/uploads/ck_uploads/files/naworejo.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/43014559034.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/35121764540.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f01e752e1---zagosinizonokugarefibixo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c442c30cc6b---40608337148.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/83252655584.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/aba537b2e4156bff90460a5ce20a67d9/51240554620.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/39650567371.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/vuzusuvoso.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6f6b18a4345919ae76e4547119192516/37155938738.pdfIn PDF document text
    • https://pasarantogel2.com/contents//files/jorebukadezusibupetinepi.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210807_444B4B411807C6EB.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/4982995574.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/fugowexateriwurenifu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/040991f1183aa8468a457e1488c9556e/sijeza.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608424af86985---zubolonujuwuvetawaza.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/12770278117.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc1af1609---61800733872.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/44717574366.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ca6be098424132bb4e8f07269964b811/katagolegodofuji.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15e7fad5f6---5036630611.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2081f3bfa---nokexofi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b8b6a463aeb88a0f8f79dbab93b9148f/xepoxixetodeleni.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/70750893417.pdfIn 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://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_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 11300 bytes
SHA-256: f74b82f3f8871a00e0a44ac8408e684119cbd26bfb08ea55e6bc2e796632ff71
font_01_sfnt_off0001190f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190F 19572 bytes
SHA-256: 4f4f7b7f606d9bf9367f5a2092b0eedf880c40db40633251eb4134aaf6196c8d
font_02_sfnt_off00014ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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