Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c4888f2d7a5ccc…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 08:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bf6851a44271573a1960039f4a52e9a SHA-1: b02048eb384412980fe5771fab3f516bf0630c38 SHA-256: a6c4888f2d7a5ccc40d8af7b9e0b71bb4d88411a5753b5b2a523e5c920a4d91d
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to websites that appear to be compromised WordPress installations. These links are likely intended to lure users into clicking them, potentially leading to phishing sites or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/58c897cb827fec7096fbf363334d9ddd/28186036707.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f646733a6a---69177116271.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/021a2b488c8215b8d5e2df622cf463b6/53064606363.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/sopedex.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2a8d7a89---tazirokixekosudabeb.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/53156194040.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a8210ba710a3511bbec6b73ebbc69b24/vikopeburegivepirigupon.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/36077679031.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/7283635101d20fbc8829acca84cd515a/61545246231.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/6598f62f360e1326c6e24779d8003d1e/vadoxab.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/68392551721.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/mepaw.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/kevorezaxovezitovo.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/493891372.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c516ec20847---22655141993.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26dcb4e0bb---kufudasajaturi.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1624249049.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/40300185286.pdfIn PDF document text
    • http://usatovl.ru/upload/fckeditorfile/33251187753.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/5f33f156bd2c0a858de7bd8a5c808569/14880718096.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/78972420515.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ba069992---luwozimonuwadat.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/sokonotovorinilusuze.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/wutulokujutesewifunoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=behind+the+rocks+moabPDF 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_off0000e4ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EF 17196 bytes
SHA-256: 1038b4ec50c03f132b089e1acf08d17ad95b6107693c6a9ef2a56d66d7938e85
font_01_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 10872 bytes
SHA-256: bce058b09b8b381bee1ed96946202fb86aa9c5d0ec6e361115481484358f4af6
font_02_sfnt_off000129f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1