Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde2eee7f4ab2c0a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 01:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4c7730d79d62b5365927c236cf2188cc SHA-1: 77a626354263c872d75bbca87a5dc4ec02fc8743 SHA-256: fde2eee7f4ab2c0a1ba2e0e031e8fd7c3112e72e58f162355b84fcd58d19dcdf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. The presence of numerous unknown URLs further supports the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://treasurehunterdetectors.com/ckfinder/userfiles/files/59042104349.pdf In PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/90209067194.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/32696368213.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/sikaredefexowe.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/61383a62378d5597be18442773d4c943/12983096323.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f0c59d15---zemifaxijatinalidabadi.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/xonurumezipodi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/30634453608.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/kramab9q2plg22legssbfb1qnf/savuzewepiluwor.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/gesapuvomabolefapuwiv.pdfIn PDF document text
    • http://glenbardwest1965.com/clients/0/00/000b938fadf99fc3242526d4297efebf/File/87839116678.pdfIn PDF document text
    • http://airmon.hu/images/files/xenezubafukajif.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c467cd1f631---14045401829.pdfIn PDF document text
    • http://budka39.ru/files/45806491473.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/wowabuse.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c1d72e9e42d0f97370c8e61c015a71be/jabomitawaxaweditakexat.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16107ae4a1d155---roloxoz.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/kopejir.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/18432723208.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/gukafusebekisoviwinopiv.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e8d075036ea2e66fc53b985715ccbe15/93563863978.pdfIn PDF document text
    • https://bataretak.com/img/files/file/mibanujanireriz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=making+sense+of+vascular+ultrasound+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_off0000e32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32D 17092 bytes
SHA-256: 8c9cf571c083f4bdd996e72ab8d432c193e9997917a891f97eff4c8bd240978e
font_01_sfnt_off00010f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F71 11048 bytes
SHA-256: 179066169b236bb4b65376960a0fd505d19f30dfea76915bc9beb226ed6456ed
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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