Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7aa31a21d1db312…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 00:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fc08a3cab08e882c0e6c56325b1f51f4 SHA-1: c089dd8d90d939257e212fce38d2ca434b649c68 SHA-256: c7aa31a21d1db3127944b41b9801ea7c193e6b2aaabc7714f55ca2becd34fed3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF file contains numerous links, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV both strongly indicate maliciousness, specifically phishing and trojan activity. The primary attack pattern observed is the use of a malicious document as a lure to direct users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irinka.org/ckfinder/userfiles/files/95808604998.pdf In PDF document text
    • http://alexlunacoach.com/img/editor/file/94285820612.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/nodinamazavibakasojuv.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3eabe23cd16a6a73084aa171897ecd71/92124693897.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/f335vegcasehagqjb22phf7nk1/mixavezekegoxepudi.pdfIn PDF document text
    • http://gdgom.com/upload/file/210826185650086894yy5g3a2f4227.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8f1f09ef1370343b9edbc8bcff057b96/vevezoveridipusegow.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/18a20d54cc0155c0309ca27b85e94c17/ritipenowewovikap.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/xafikedizefukud.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/55026401614.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/17431023420.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/70244562060.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/teviromipivade.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/94815040335.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/04238975675fbad80d1edf545665e6eb/89851929807.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/jotisaxikevuw.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bf720b2f7---bajexabowinu.pdfIn PDF document text
    • http://15889163.com/ckupload/files/sutew.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/ruweguforop.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/tagikoledigureve.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/87971425147.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/67955282101.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d8ed2d5ddc361fb19407b381be69da54/dipesiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=circle+radius+diameter+circumference+worksheetsPDF 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_off0000d958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD958 11052 bytes
SHA-256: 3f09f44b6fdfa156c80cd4ac2483e893bcdcdd8359b53d63a62d06fd5c0508f1
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 18304 bytes
SHA-256: dcb9d7349a014128ea184e0eb4db1299cd6b30547957630f45d3cdbde5f1ac07
font_02_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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