Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21c420ebeacd328…

MALICIOUS

PDF

74.0 KB Created: 2021-09-08 07:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c0aed6362bae6086cfbbb28657bae4e SHA-1: 2e90a9d9320b8d1c3cac772e5a70181ad49d3b7c SHA-256: d21c420ebeacd3283a6941d1cb828dd2d0630c88632d5014fec30d1d371f3e86
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, which flagged it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf91062ef4---58585948387.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b9bae6a1c7bd6fb5d05bba05b866cf56/19430867907.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612478bdc39a5---nogunebanetip.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/vuxenagi.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/sikepimoposujop.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/18435168016092a4e9b71d0.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/tuvipaxulo.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vadidem.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/fidikijosoj.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/71117129547.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/45947096863.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gofetidogivufivademu.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/6002539227.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4b1c6a8520942e51d592013f2b4c579c/14434198931.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/12581504910.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/jevubasime.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7497dbf612da26358e174b237c0e9407/lijofopobojuwozi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098657ce00fe---xofopoxanivakeje.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/55845b8f17067df61de18238e1ef569f/gekonuvoluvefazun.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/tosetefepureb.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210728060336_2015976333.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/malezulepajukomuwip.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/63920574656.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db88e7ea8c---8114738635.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/mowefizivo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/37c16ab130b1b66be9e1d069b5a73b9a/53719631588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=instrumentos+y+tecnicas+de+recoleccion+de+informacion+pdfPDF 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_off0000bca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA6 16440 bytes
SHA-256: 896858bb197293ad64ce157f4868637cf5250627b7d967194257f61f63c80f35
font_01_sfnt_off0000e5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 10944 bytes
SHA-256: bc8bf88dfd071053e16d5f2a101dfb5fa2dab155124496154110dcefb06ecaba

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