Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ecd41a691218dd…

MALICIOUS

PDF

84.0 KB Created: 2021-07-14 02:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f37f0cec3246652b8a4b7ac815e840cc SHA-1: 27a529ead9386ba5d0e663eed37f4c98c1e39901 SHA-256: c9ecd41a691218dd52077b573166c366919b06bf73688e2c62ede6095600c5e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://caryhigh1987.com/clients/41333/File/xunisif.pdf
    • https://windsbs.biz/files/file/35566839949.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d874b151---larasosavofabikixolipeb.pdf
    • http://uk-finansist.ru/userfiles/file/zolijidudagava.pdf
    • https://ludifrance.fr/userfiles/file/43566776259.pdf
    • http://leebyunghun.kr/new/upload/board/files/fomut.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a186de3509a---dexuzasobuvusu.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f15153605---61378075649.pdf
    • https://ajitcoatings.com/uploads/88649126740.pdf
    • https://afra24.com/basefile/afra24/files/leponadutavo.pdf
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/xivatatamafapiv.pdf
    • http://aotwresort.org/ckfinder/userfiles/files/depasanuganesede.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9195cba3a---81769798224.pdf
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/80065932026.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160830ee291715---36791923522.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/37798122059.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dbde7638d---91419579519.pdf
    • http://hoteldazegliotorino.com/userfiles/files/95703641570.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/0cc009b5e5af6f4561bbee1f18ba93a0/50707882343.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ccnam49lls6ibn4t0srg6m48ml/9207652853.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4b4acaec---61365506468.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/37ced39fc4680b8ff3e1e416e0ac5359/61839290803.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a7f1f392c832258a3258f4149d2501f/jibazawi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=your+love%27s+got+me+lookin+so+crazy+right+now+lyrics
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3096d26e8b0c96dfeed00dc0f298db53/pedoj.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_off0000e373.bin
1ff0cef4bfb97dd4a5f9fe11eae4c4faeb570fa260e0885afe2def8d0821536e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 11212 bytes
font_01_sfnt_off0000fdb5.bin
00ea65893f219c9cee4217a7a53724dc60bb196774ec4f007565fb5a1f692b9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 16536 bytes
font_02_sfnt_off00012858.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16792 bytes