Malicious PDF — malware analysis report

Static analysis result for SHA-256 751f44543da9d6ae…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 22:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f15631ffa753be44a4842922034e6de7 SHA-1: eb4651097bd376d8672af48f24e7d66b8ca459f1 SHA-256: 751f44543da9d6ae44b1c3e780bd48dadd35e52c149dd789e7497fb88ed65401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final malicious destination. While no scripts were directly extracted, the nature of the embedded links and the detection signatures indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/77e30079d5bf89ccae64cee19ca924bf/97481826157.pdf In PDF document text
    • https://limsurempat.com/contents//files/nukusilomuzipefexesefesa.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/23442007903.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1517acf5f---31197105199.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/941a3d7dd87454fa520808ee825ca203/48834448879.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/08a2e1729e100b0780bb814c53b51a23/89611698952.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/biwatijazovilivukunabawus.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/jekev.pdfIn PDF document text
    • https://soechi.net/userfiles/file/67999599255.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/tobometapixadepifopujufig.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210730171403.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/34632120959.pdfIn PDF document text
    • http://hersheyhigh1981.com/clients/37302/File/3599865730.pdfIn PDF document text
    • http://potya.com/61160770037.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/tatuzevejubavi.pdfIn PDF document text
    • http://moneymaker-gold.de/files/fizilaketipininasaxe.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/bekitabeduxilejo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2140312db582e59f9ea3cd5761634b35/74832581098.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/judabop.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/59700631720.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f3f7699fd1716343b792e1c57e26acef/73442632424.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e3f7e9b36---827501041.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092451394bdd---61854482262.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/179879578860d20f1eca5b5.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ef6d084418e885db1aedf477f1bacef0/90467481427.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=gest%C3%A3o+financeira+basica+pdfPDF 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_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 11012 bytes
SHA-256: 259a44b3ebb79bec92a421ba6b8cb8200712f08e45594c07d6f8faf2d7ad1c94
font_01_sfnt_off0000f87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87E 18688 bytes
SHA-256: 1ade4659f28c94e2cda3bdf15573d4ab5934eac212ede2f60debe7e138dc727c
font_02_sfnt_off000126c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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