Malicious PDF — malware analysis report

Static analysis result for SHA-256 3770d37f15a6bd11…

MALICIOUS

PDF

89.3 KB Created: 2021-06-30 10:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b57aeb4c8ca3c5a88c8f2271553fc6c9 SHA-1: 19392ad37ea43e637506cfdea281ce2554772782 SHA-256: 3770d37f15a6bd11ba6b0e5cf2495158304aab084258a31e143b7d912a988012
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow, likely involving the exploitation of PDF vulnerabilities or social engineering to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/60f774agvm49epda3n3h119aku/69013906214.pdf In PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/45090285440.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/fifinukujiwefenajitalonaj.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/10a8e8639cdc13465622183cea076a7c/24222177594.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/74783904790.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/611622844.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716bdeb9fee---59492404214.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe249b22f2---zegemetozusolilum.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/722b3fcca078e3d431c7e26fad9e8cb1/92888137748.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8c0c1ca05---23698009525.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image//files/40450151052.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/76410218848.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6069147e---soratusidobosibe.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/wimukenideripikumobakad.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160956dea68ef9---74264421648.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb012ea139---84420515727.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c816b4f82---19726584128.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/8beaf3897fb6ce8cf479f31c433c193e/63003644880.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xepewewuferilejadanewuja.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608509734737a---vugisozizavo.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/vepinipese.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vovemikefosabo.pdfIn PDF document text
    • http://mousike.it/img_ins/files/tifumakivo.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba3131908---74234114219.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/nikesivutokiwafopevaz.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/105a4f55e761dd5e76b227b66569485b/bimisiranapufaterosamupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nota+movie+in+tamil+downloadPDF 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_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 10272 bytes
SHA-256: 4e0461716bda94834ace8060a802884bad7be2e98ae7257393178eeb1ea4fa82
font_01_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 17116 bytes
SHA-256: 8c2705b85c5de08fd1818a932afa32c45ad518a7b2d668c58e04b1706020a69d
font_02_sfnt_off00013fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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