Malicious PDF — malware analysis report

Static analysis result for SHA-256 40374009bf7108a8…

MALICIOUS

PDF

81.7 KB Created: 2021-08-27 15:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 452fc78dd81c7f085e6d140d71da2382 SHA-1: da4c560fe102ababb8f1749dbb1607603f8187af SHA-256: 40374009bf7108a84982b7d6475305eccc5e2ef9208b9452634d128fe518d99f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The PDF is structured as a link farm, with many URLs pointing to potentially malicious content hosted on compromised CMS platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/44baes1tmd4ptsm68uv6pmklj3/34705856648.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/talamakuzosu.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/xupamonavo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610371712d41a---jaxopunodikizufom.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/90305511876.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084894f2eea0---gugofakuxifalomu.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/506a25ad6faec48f4ac3c5f356cfac5f/47184128977.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/18c520e9009cb17daed5e5bae27a1a3d/dozanu.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/37c322ac9fd958336d2ee4458283ee37/noxagi.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/jekegawotidoxalese.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/bewiwakenujis.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/jojakafegowof.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/28650323695.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c033445b771---30689458676.pdfIn PDF document text
    • http://gdaniec.com/upload/files/26275209739.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/39680086882.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/87501881359.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/62414348809.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8c798702b25c565232c4cca6b7b8f395/tofope.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/97258640183.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/10834911940.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/govuzajuraru.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kovugajolotupiwoxoz.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/84335281656.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=streaming+film+tokyo+ghoul+live+actionPDF 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_off0000d395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD395 11064 bytes
SHA-256: c6db603b1a503f62190969a76a3ad44447aeae4173e3b40e3c674db41b737fa2
font_01_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 19808 bytes
SHA-256: 4dc9e2b4f6688983e356c0868e216c2e94e2bf9fbccfbe420f6f3dc243dca51d
font_02_sfnt_off00012118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1