Malicious PDF — malware analysis report

Static analysis result for SHA-256 60c7e84dd1a37471…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 15:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a088e4b7473cdd5d98c5c8f046f3439 SHA-1: e562c1409e5524413991c19efc91ae07932b6599 SHA-256: 60c7e84dd1a37471824566d92f7cdebb458786724b766564350459afd02258ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for distributing malicious content or phishing. The presence of embedded URLs and the PDF structure itself, combined with the heuristic firings, strongly suggests this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

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 http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56uej7o8pjc3dqnl00udgvcfi3/xuloledilobal.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a33f5b4d1d5---jokut.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a85be67443d---ranurumapatapekiz.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7895d13ef---ragabevavanuzajobal.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0f7f38851---89600244235.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zuvuzafekogidosesewefaku.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/88090232489.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a1a4a9bb502a4ab7368fdd239543e805/7969598587.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a914149c5---13015287458.pdfIn PDF document text
    • http://exima.kr/userData/board/file/nugizugevilosavolakotaja.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb36bc5b15---lanepalenanuvu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e13aa78ce4d---67240936109.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/zenodizofomepatafolopamip.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160f96cca79ee6---vuwapup.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/72493454185.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/jajafatodabelodedibebesar.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/evqd3m3e4hmd9m01pgc9aepp53/lotuxovigovujaxawozu.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bef6e349bfb---putoxezimudewidugudaxezam.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/sovenu.pdfIn PDF document text
    • http://aimic.com/userfiles/file/lonopazojavipolureku.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/8925c318d8e143cdd87f5e97220d19d8/jinizozukogu.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/segabisimoxolixeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=change+pdf+page+size+acrobat+pro+windowsPDF link annotation
    • 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_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 11172 bytes
SHA-256: dc3785d4346019d16e7df20b3cb1438976b26d17dc55ed219c68a9cd1424f591
font_01_sfnt_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 17872 bytes
SHA-256: a85baf9a4f4d4b3859b2d4aa62a11ad4302499134b232f40b9d856f0fbbd2f1a