Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd9692aaaf9deed8…

MALICIOUS

PDF

80.3 KB Created: 2021-08-15 00:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7a9d149bb63e7e080772760d93f23461 SHA-1: ed7daf52b4ab39a2abe15213a3b1eb57a65ac9d6 SHA-256: cd9692aaaf9deed88024d50a37beaf677a265e8caa2bd5414b0efe4631dd2416
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://haus-st-otmar.ch/userfiles/files/213310173.pdf In PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c323ebaf7c6---25921194780.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/dc9c8be84e6bda32f2cefe2fa4ef7785/16495831342.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/d0bf8106963350ab8d56bbcb79038bdf/11009322298.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/tivogadolalomagesek.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/samekorub.pdfIn PDF document text
    • http://teplospectr.ru/images/files/30814372668.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd9ee48df---nuvozusedaburev.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd84967838f---30018720659.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/63459826108.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/pagogopis.pdfIn PDF document text
    • http://armanetti.com/images/luxojifig.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5bed247e0---7634325714.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160befb7b239ff---zegeresomapoxudunaxuda.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/81506360471.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f146ba16c6010411dcd252b2720750d5/56934019522.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/80682713207.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/relofavig.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/89526424227.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210628092625_rongj3.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2c3f6fe22ffb60dab57822f3be49f111/lagelu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/a51dfe02df2068ca075f625808aedcad/veduvutefosewavajimedub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=diccionario+de+etimologias+medicas+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_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 15828 bytes
SHA-256: 7deff85f0f73b2a2e1da228016bcdf32bf680d20503b8de2c7f457869e985a45
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 10964 bytes
SHA-256: 7589a306b9721920f1bbdee9448d9fc936ee471c09120c40f36e020efbd80d60
font_02_sfnt_off000119cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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