Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c704784a7cc946f…

MALICIOUS

PDF

74.9 KB Created: 2021-09-06 14:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31f9c72adc4294cffc279278a86387cc SHA-1: aaece782190270ae7d84f120d798ad9cbc9f8d93 SHA-256: 3c704784a7cc946fe43346cd32033a8678ba05d6033415fa8b6df8b9fe21934a
164 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'Download Now' lure further supports this, aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vaynhe.com/upload/files/perutabadur.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b81f7b9aa2---46502384253.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efeeab3226e---jamofolelukuvusurowutaduw.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/fokofano.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/suneram.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/dizawog.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/77563151359.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/xuziri.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/memumememotifumosup.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/durejufugobovoratebasixi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-16/20210516152550592542.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/telojarolu.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/xuraxuji.pdfIn PDF document text
    • https://istanajp2.com/contents/files/wejidofujuvajajere.pdfIn PDF document text
    • http://186086.com/upload/files/panoxowenu.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/zoren.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9309797610---95747364962.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/momeden.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/kuxakoseserapodubixefig.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/35486821109.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0eb5e5e7---fowonuroduni.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/danogunajilolel.pdfIn PDF document text
    • http://biosite.ru/images/news/file/fesuvo.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/35146128750.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160715d1b6f6f8---vepis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=alter+ego+b1+french+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000beeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FD 17920 bytes
SHA-256: e7ab248158a488fd74d051776bae3d764ad1192fa8b38dc991b851c668a2f017
font_02_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 10648 bytes
SHA-256: 948fd683ed799d04c58e10163eb20bbedb34a58943a9f2e94d7356d22e003160

Open this report in the interactive analyzer, or submit your own file for analysis.