Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f8807e42e4d977…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 10:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a975923f301223599e58755195ee460 SHA-1: ae5b342b7271c24ab0e89a176b4875239f1fecbc SHA-256: 86f8807e42e4d977511220d9b131716ea749e2cefe9afd0a46bc990114d52088
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics (link farm, compromised CMS upload) strongly suggest the PDF's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=renal+tubular+acidosis+nejm+pdf PDF link annotation
    • http://e-baze.lv/images/site/file/nasokuxepu.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/xowuxusoleviru.pdfIn PDF document text
    • http://viorina-deko.com/images/file/33366452483.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/99410970446.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f26474dfea2f4db3acda8dbc685c573a/kimiwa.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608993adb58a2---1288154432.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/mavojabefu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47a6c8c1b---vixaruxakun.pdfIn PDF document text
    • https://pindimana.in/uploads/file/xizadigotapukijojif.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/wewukusamutifu.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/xajetoxexofitevojuj.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee024d76df7---46588427736.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b967fa1d---88092169372.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/52942047045.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/7894fd592bbf74393a60ec7fdaef337c/52310146269.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/vodilalibavajemux.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/kugukazoguxosebabizuje.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/74282751177.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/pupetunilosuwere.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/bakabitejalewukejuxu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/68s24ufdsr5r5lj2idnlraammn/88679780396.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16135eeefe1dd4---51237155256.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976e2cdd5f1---44564781983.pdfIn PDF document text
    • http://usagimatur.com/files/others/nunajagigiwepimegugote.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_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 17204 bytes
SHA-256: 0c7129c8ccc478a5fbeb45a6147ae69fee4c0b6f2c2cdda10d931a6a647cde32
font_01_sfnt_off0000fd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11581 11196 bytes
SHA-256: 2dc3679ad20de7dcfe62cf41f1b907b25be41cc625ef838eba15b531e0b59e0c

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