Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dc7ecd372a711e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 20:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d58e339db169e30002af113b4d92728d SHA-1: 540eca6196ffc80e3a4f911c17f24e7b3b0a9590 SHA-256: e9dc7ecd372a711e50c12cf309f35d6f7f96fbf43cbbb46a9bd14cccbc7b69ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous disposable domains, likely intended to redirect users to phishing or malware distribution sites. The presence of multiple external URIs and a link farm on disposable hosting strongly suggests a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=y+in+words PDF link annotation
    • https://codecs.ro/images/file/65525631090.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/40666433810.pdfIn PDF document text
    • https://costarica4d.com/contents/files/xumuviwov.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/54e6a71d01d154615b2fa3e818f8b18b/zopinarujubukevolefa.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/83615159402.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • https://inarsindbari.org/uploads/41861127425.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613613676a909---dujipes.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/8044590420.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/60448690161.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16138d42772914---2608583448.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/91167668885.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/dalobevilotafagitinibu.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/merigu.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/25868621826.pdfIn PDF document text
    • http://willbramephotography.com/pobemizatawu.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/3052086210.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/bodowubagimufiviworef.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613767c10311b---93745304330.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fdb8052b85dd8ad1c58f4e461abed2c/rugerebegezosutajafatus.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/67587317956.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/jewezujuvukarudixezo.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/6805364018.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130354773ab0---22455761617.pdfIn PDF document text
    • 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_off0000b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB530 15732 bytes
SHA-256: 9972b75da4d7b06015040e22c19e59a5932522293d625cc80d7cc5f5a9594a9c
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 9872 bytes
SHA-256: 4086b754c928df07dda467b83fa9b52206d3ecee449c420a8744f01cc117fa2e