Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d708afaede9c21…

MALICIOUS

PDF

88.0 KB Created: 2021-09-17 15:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 40d1c560f3a8a2d5c5aa401dec3e2d3d SHA-1: 717d85860d49ff332c23086798f2870bd96f867d SHA-256: 46d708afaede9c21d6ef878d09a5aa38a948f4a59f497e7c01b41290050684f5
164 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. It features a deceptive download button and links to compromised CMS upload storage and disposable hosting, suggesting an attempt to trick users into downloading malicious content. The presence of external URIs and a link farm further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kiapelhrimov.cz/UserFiles/File/pefatulawu.pdf In PDF document text
    • http://homesunshinepharma.com/upload/files/95753582573.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///sirifififamek.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161331274b74e3---jimajolojopazitifuz.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7b2d7e81---88203993213.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f56821d42d---20395329695.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tasikinamoliz.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/bigevij.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/31825885099.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/kejuregitaruno.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/71595226345.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/99361289475.pdfIn PDF document text
    • http://www.bash.cl/media/file/nezojet.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/32082690210.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/59374885568.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/memobefedodopazif.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/faxes.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/kisofub.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/2716842839.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/27672419360.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb39df053f---73113388347.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/96219595386.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/supovusuxudategujik.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ef93k7dd4coiu2qevfrv9dv4g7/88049970531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+see+deleted+text+messages+on+androidPDF 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_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 19004 bytes
SHA-256: ab0e81f2bc013debae0cb43f66d71c819b179ddf1b4c632661ad6464893c2b0b
font_01_sfnt_off0001210f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210F 10940 bytes
SHA-256: 2b1d473acf832d31f670080abd1c6e7b71df623eeaf564cf8cea5323dfddd3c0
font_02_sfnt_off00013a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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