Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f0b4a28ac30308…

MALICIOUS

PDF

73.3 KB Created: 2021-10-07 09:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c05ee1e4e9c28b7165f3783ca556c6b5 SHA-1: eb8ccaa9d1b135bdedade000a33f023a56178cac SHA-256: 37f0b4a28ac30308863145ab9b0bd9d190fe00d921ca495b1a941fd2f854e594
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting sites. These links are likely intended to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4715

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=the+masters+2017+live+stream PDF link annotation
    • https://ra7a7p-h3ba7.com/contents/files/zanopuzabapawuliwinuj.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/xejidawomufowitud.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/60410393749.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/24767116647.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-28/20210928204728173697.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/gagetorebufisugezegeginu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/92092992216.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/pewitukoxirofewemuxaki.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/60010322996.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n984msoj9l6c1t43904kudivu3/629026483.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/61107744510.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/32015451950.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/45712074936.pdfIn PDF document text
    • https://onlinendttraining.net/files/32920181430.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/bukaturajubunelofu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3fb6c91a0a8243fedb03f7251ee8d6ee/29371392638.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/vemulipepijimiveputa.pdfIn PDF document text
    • http://kgmda.com/upload/files/81117467274.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/15d542c95e99405cc61aa8ced07a81e6/puvuwusaxamalibefu.pdfIn PDF document text
    • http://planetamama.ru/files/file/65424859682.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/28775333905.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/d57b8275da404c9ab57c13c58ca60515.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/muriwomubapujazozujemuf.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 10520 bytes
SHA-256: 9319ef43ce62104e48331a7e394d4076ca7a5aa58daf26656aa2533cb85ee622
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 18272 bytes
SHA-256: 5530eccd7b47ab93563f0a2a6037a5d1f4b2265cc6384cce24f72c78fa3928b2

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