Malicious PDF — malware analysis report

Static analysis result for SHA-256 188682bf610b89f1…

MALICIOUS

PDF

75.9 KB Created: 2021-07-02 10:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e4f620860682a2c3c2ea55c880c65765 SHA-1: 851f1c93890eb1884ca2e302cb9e04e7a4221a24 SHA-256: 188682bf610b89f16f62612c60eb3d7e6a23f8be9c795fc0b98469597bf14388
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, making the document a tool for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://zaragozadenoche.es/upload/files/73076358116.pdf In PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/af8ae0c82ae184c062b49ff69ffb6a87/9135715448.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086f3177b7d0---vodoxameji.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/c76q5tcgf4p53naflk21hhlho0/widumudefafuf.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/68748578109.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c056d9e6a---babajil.pdfIn PDF document text
    • http://vce34.ru/attachments/file/25775918901.pdfIn PDF document text
    • http://citra.cl/userfiles/file/maxobisowipufuzilitalinaj.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c509e5807e---96925289632.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/pezubibajigogixobekurepi.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e27dc270---tijasawiwixidera.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072109b22c7e---5015074096.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8006ce48---vudozawamexafisovobavo.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/pawemopeku.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1e8529e35---lefisarop.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/54ca46e3fa0e241bb3349077778b9bbc/mawamil.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7g3bvmdvntu9ni9shssf4afja2/gulojuxisaxov.pdfIn PDF document text
    • http://limoride.net/gallery/file/95210286823.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b85725b3---36377740432.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/je5b8ke0ecr7e8t6elea1ijtkl/75359528637.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/38807444155.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9bd05210c66298618f85dd878a70b874/11810914786.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f861ee99c1---9098959700.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/19211690766.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/dfcb47f271c3e79de438c3eafa22cb55/51951424221.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=another+word+for+out+and+aboutPDF 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_off0000c5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A3 10452 bytes
SHA-256: 5d0f19cad29debf9350ef35a8e2d99fa887b292e1729ab9ba11d8e25b4df0f01
font_01_sfnt_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 16616 bytes
SHA-256: a7b643008b6af2f1f1d628084a0e98a38fe1e833b863bb195a83744a1c5035f3
font_02_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1