Malicious PDF — malware analysis report

Static analysis result for SHA-256 4659101703205f7f…

MALICIOUS

PDF

95.7 KB Created: 2021-07-02 06:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea43d2a07e22a43327221159e400f3ea SHA-1: 3e3a035f752b9b5d525ca2d4b4bbb17d25ca8d36 SHA-256: 4659101703205f7f6867c92f71b824c6a8ebaea3c1d4967bfb2ab916bab66f93
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb9738eaa---sivire.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81722cdc1---womuxufujozalir.pdf
    • http://alumcity.ru/userfiles/file/penupololido.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/20307414187.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/kojexilofojo.pdf
    • http://aftckwt.com/uploads/file/49997455850.pdf
    • http://bociany.sk/media/file/75870620576.pdf
    • http://on-video.com/movies/movie_data/file/dutatuxorego.pdf
    • https://alianzatours.com/imagenes/file/39249600373.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160975239665bb---xazivobudiferisesa.pdf
    • http://sity-luxe.ru/userfiles/file/luzenawutalovomepebododem.pdf
    • http://policylic.com/uploads/files/vamukiderafem.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11d7802be4---28407668858.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d110f1edacb77842a067b16ce0d326a0/9893927211.pdf
    • http://aitrans.cn/UploadFile/file/F1202106291526454507.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735f7abc290---94621083105.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5qnkd7tnfi48rj18edsr09r84m/paxefezi.pdf
    • http://gtlmarinefuel.com/userfiles/file/11492230892.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/49966257a0652b7cfd83cc0e5487b504/nugafojipusola.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaeaa4904c---wezitax.pdf
    • https://eyetracking.pl/userfiles/file/74699916646.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=tybsc+inorganic+chemistry+mcq+questions+with+answers+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011074.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 16792 bytes
font_01_sfnt_off00012886.bin
d07a335234ab88104c98d8cfa38a36b30cccdb63d5eddbd2b31d4c62f75ecd63
pdf-font-stream PDF embedded font (sfnt) at offset 0x12886 17572 bytes
font_02_sfnt_off00015684.bin
9638d1ea9907a5b8fe09368969d0ab42593f97ea67ea0530878789aca37d9599
pdf-font-stream PDF embedded font (sfnt) at offset 0x15684 11568 bytes