Malicious PDF — malware analysis report

Static analysis result for SHA-256 71663ded9cb8b3d1…

MALICIOUS

PDF

98.1 KB Created: 2021-08-04 04:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9fc8d86654919b9d71c4fc6572062af2 SHA-1: 36cbc89f701d1176e18a71dd23e04a81a45bff54 SHA-256: 71663ded9cb8b3d1b5e930a095dfaef7f4e620801acc5bde5bb8f3307fc9fbbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://infrive.ru/uplcv?utm_term=que+le+paso+al+lunes+pelicula+completa+repelis PDF link annotation
    • http://elcampoeco.org/FCKeditor/file/wilokusuno.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///seketoxaduwafakige.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd94a11f3---donomopez.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c501de71eba---foluwabanazerijuvata.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa806165047b8110390790c17d16ab46/62277016078.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/donolave.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607536c6c2ddc---liluvowevapona.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/guxufer.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/44312235929.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/21180225095.pdfIn PDF document text
    • http://jogforbigt.com/clients/6/61/61f7a61d17da296148a50ccd59c4a139/File/29232372208.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/27184525432.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/2a005aaa275197e3aad7650ce4816d8c/68690749771.pdfIn PDF document text
    • https://cityface.cz/res/file/84185572881.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbb9d3a33---98999072117.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jaretixifipoji.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/retevotetumezimarovadu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0beb177cd0e09755a8a6ad4b8a7f9be4/jipovu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/uac9a64jr5bqt983v857ls0ci6/1622403373.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/15400202487.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/ed7efc3130c51d200ec3b1e9998a6903/90839953456.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/masikaxuw.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c06ca74c0---fijusijudeleluxi.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///vesabifalifikubazo.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/ee707a8cd4069cb35b4e693b9077ed84/memiferigamobatalawebu.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/wafanugegosogenige.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083db9a76ea3---pinemivi.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 18708 bytes
SHA-256: 11c5f8ea548f5ef07e4d2b0daee48848e2ccf1d2d836d12c0f2897b6c6d10e30
font_01_sfnt_off00013216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 10696 bytes
SHA-256: 90d0769b583451e1006b32bb8c1332486e4bfd9e7f8c2a6fd0d6e5153386b4ae
font_02_sfnt_off00014ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB0 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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