Malicious PDF — malware analysis report

Static analysis result for SHA-256 686bf409ea1dba7a…

MALICIOUS

PDF

79.4 KB Created: 2021-09-13 18:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed767a6eb9ac96004f23c525edb50efc SHA-1: eb81250a6868ab59e5d8598b884e8d4620ea2921 SHA-256: 686bf409ea1dba7ada77c0a4243ae822c31cdfd19f37b949723217ae294e76ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://cambodiaangkorhomestay.com/userfiles/file/sotorumaxilukafopifuf.pdf In PDF document text
    • http://kiko168.com/UploadFile/file/20210905135632489.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/14875559245.pdfIn PDF document text
    • https://tipresentoio.it/images/file/34847522039.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/5736571524.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210911121936.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/mesilitobizatawejul.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/67523101713.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/jolof.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb60483b1---16310065670.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/9571082715.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911014721.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300ec3ea7ad---17537798907.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/73092665164.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/20838832358.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/37005305648.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/rivug2a0ca8c9mnl32q4q25va2/tegutixoler.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/gujifegejiradetabupuxumo.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/bevanitisoj.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/zawaromijugulabazoxoweted.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/37304923671.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/b38af1c352b2c21dc5e0b3909ef9b3e3/49324007720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=motion+tracking+in+kinemasterPDF 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_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 10612 bytes
SHA-256: 0421469dd25e3d480170ce18d45206ded6606a2f01d84123dc6edefe89813107
font_01_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 17988 bytes
SHA-256: dc393d7449bdbb64deb32af4b3058189fdce04ffa54c9f72a739a0ea274da958
font_02_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1