Malicious PDF — malware analysis report

Static analysis result for SHA-256 d878fa47ea8b2759…

MALICIOUS

PDF

83.3 KB Created: 2021-10-10 15:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 438da998fe4cbc9fba69cd68e7ced0e0 SHA-1: d931ec97696ef5cbd65f21ef2c9851b164682c83 SHA-256: d878fa47ea8b2759b3184408838a12ee81cef5d431f4a45ffd1d2279ba95dea0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external links and the nature of the heuristic firings point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://economiadecomunion.net/ckfinder/userfiles/files/disakubukejikudenupom.pdf In PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/26177198046.pdfIn PDF document text
    • http://palcev.ru/userfiles/file/jenovelo.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e944b5af29---zunup.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/sopugozonozukusotalen.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/waledagozugexopejunoziven.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/752afb4bff5248abc33fcbf4e3a5be4b/81226514981.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/19182011514.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/25/49082667610.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/rijigupolixozaw.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/kowipixi.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/petumedisimulabafafalufu.pdfIn PDF document text
    • https://latgamatniekilv.enterlivani.lv/files/file/67964062721.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/lanopepunubanogifoz.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/38128723023.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/xidabizevumafupowawemubul.pdfIn PDF document text
    • http://upakuika.com/img/file/69461532826.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/60998063825.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0fe8c584575b8532ab7f8944a5ecb381/28710301828.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/miwekitupugen.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/winarusuzewatonid.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/58260283352.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jozikoloroxuze.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2d66d4cf26665b914a288daf7f11af5e/17570152117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=swollen+feet+with+blistersPDF 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_off0000e1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A8 10448 bytes
SHA-256: 662543725c46ed9502502d9ac413dd97cb9d841ca1624e161da9be82b39ae58a
font_01_sfnt_off0000f94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94B 17736 bytes
SHA-256: 11150d3d17374824a9d2ab07c0aa8b69f9b6cc7506c28ab6ba0f89ab20618875
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1