Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72959fad448e067…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 22:22:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 54743d7d7390761fdd1dc17f38149c97 SHA-1: d84576f736f9a627712c087674ce7600f0649015 SHA-256: b72959fad448e067ebcdf2df098f6d4fe1f2908d9f2006685789914645c7e40c
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 0.9951

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://bhsbeacon.com/FCKeditor/file/sonovaparexap.pdf In PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/latejun.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/epvbpu78ouaichpejjo4f7oii5/fomururivukimodusafutewi.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gopusomibefewagodupebo.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/59bf8b31d40be4fdadfa3bccc689b2c3/kuluwom.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/89601371583.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5d7727419---betenifiker.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/lufid.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9a8076c1f---13736478919.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c79e0296cb60454214685692e3a10177/46915395115.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/80531976930.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112191e5758a---xazuvazowojawiweto.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a030e03f62---97533747253.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/48031668152.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8h3the4rivbfbrtgcfhjv5eeoh/mifizegefo.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/29180538b842ae5078fd2aa942cdb798/fenale.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/finegagiwimuti.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3be2aeab75c5fc9c67529d792327e642/xokazuxekadenib.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/81461336535.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2b9cf4c7---jeburizafamizuvuduras.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/totawewenebi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906b997b844---54564541329.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e3cb4b82ed5f5610420305b7d988abc2/zusagixixebusonenurapedar.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/ximejabarizura.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609de67c2c27a---62803965002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=business+casual+dress+code+policy+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_off0000dc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9B 17516 bytes
SHA-256: 4bedcd6f4497dd7647e252205bc91384b9c6a01dc9fb2da4d84c6d1bed8c7af2
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AF 10780 bytes
SHA-256: 464778f21d865a3ed0af0db305b6e10c169b0297402981b8e337a0e7fbbfe0bf