Malicious PDF — malware analysis report

Static analysis result for SHA-256 89acf7576e24a455…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 18:33:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a88749dca621749512db9c1043118946 SHA-1: 0264b021e86654675a68cc2bad437fc920cdde94 SHA-256: 89acf7576e24a4558832ea84910c75070ef5065aeb54bc70608a228a2fe09a0d
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are likely used to lure victims to phishing pages or download further malicious content. The PDF structure and the nature of the URLs suggest a phishing campaign leveraging a link farm.

Machine Learning

  • Nyx PDF Classifier clean score 0.1138

Heuristics 5

  • 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
  • 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://queure.ru/uplcv?utm_term=perimeter+of+two+similar+triangles+are+25+cm+and+15cm+respectively PDF link annotation
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc38cf7fc76---zejagu.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/30149688917.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/66968864980.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/64364336323.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/58445437564.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/janogezinuv.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc68784559---mabodefewenivuralokiga.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/gufiximitofimogokaluj.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/7992586801.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/08/14/file/20210814_155140_194.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/30acfc8cdf3f4437ba70175141ddaaed/tusunosevureforaforixepis.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/joxek.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/01616a4de0c4563517e64a6aef158cce/xepasujomoduladaja.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/mojafolebosizos.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d10834d7a---jubefakenumewebed.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16106f360e1269---64211253119.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45bock1oroffkh2mpg2769knc6/25121778419.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/l5indiqigfeps8g1ugob7ie422/31230701726.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/ziziru.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/83894527721.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bff1dafab---pofiwo.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/615730c66f612e8d325d8065bad2cd16/linabibup.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/65859924378.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/kuwewugekubalivomu.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bacd0bc13---sigejil.pdfIn 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_off0000cb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE398 11536 bytes
SHA-256: ba8de55713f3f2c514cbc3e47644b5ff01ed0c7721ee10ecdb248f2b37d28918
font_02_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 19952 bytes
SHA-256: 6aa069be8ca6377fec73b44503ae3c4c826a77dd368a04ff9cf374e1dde872d1