Malicious PDF — malware analysis report

Static analysis result for SHA-256 552d4ab347e85132…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 09:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 76c00f41c654d0f8cdc9c507789db8d9 SHA-1: b3e77c7518c8c936cfd28cb38face54bc35ad6e2 SHA-256: 552d4ab347e851320a6dd91e7033b5023a8bc20731fc79644085cbfd3bb53951
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/45732b84612c359eb3bc10e5418dfe26/zufijitiratizosel.pdf In PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/r26k51esutokq6gdd5c39pps2q/43276350746.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc77a2847d5---lajawupekatagaduzofolima.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/53768990836.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/84231624938.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfb268a47c---85345237283.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/negaberudaxikirowojev.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/lazoxazikibakudu.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/putarorazujagufilebak.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/13382264536.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/eec23197fdcfe7f2be1967d4395ead1d/67371470659.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b737b1a3a4---dulala.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c803c76dcb---31755582809.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/20182093248.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607366c86cf26---9552453129.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/jopirogevivazipefebu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/redibuwurepupizimixaku.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/tukupaviketoze.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/lamawononumugizogo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/45920047043.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f887f3b94fb---wawabemizenolugadijibudis.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4f1b4ce2---6592277295.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/83748729441.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/75120263453.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e322aa6d---kewomilajivuziboxirix.pdfIn PDF document text
    • http://sswjeans.com/files/nizatuxinatidexodiguxibi.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/janodaralulukawim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tnteu+b.ed+syllabus+2016-17+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_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 19896 bytes
SHA-256: 4d7b24e6d7e312bb89919167d8f450c6d77046da3bb7e3c806cacde62f07cef8
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 11108 bytes
SHA-256: e1a81ab219c093ed02cba71dcc3451d1b69e493a78ce21a398d47a810381d073

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