Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5e95b6b00f44df…

MALICIOUS

PDF

79.8 KB Created: 2021-08-31 06:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8a437b6f6e2b870e95f4dcb065984a74 SHA-1: 5ae3b86d69396a65adc82965ac753558ef0b31fb SHA-256: 4e5e95b6b00f44df00ae07eee0f94d02415e82ab09f1e177875e56ab312d4ed0
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6426

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f20928cfc110d7d1557346fcb7cd1552/21335314845.pdf In PDF document text
    • http://mgtofubbq.com/uploads/files/zawiga.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/23884526010.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/rozixiwezaje.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/mutipijaxowe.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/44322949019.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0414b2c91f---zirofezul.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae40b20f632---xasonugurobesexiba.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/mikulujox.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/dozilokeluluxumubobavag.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/oimkqvrc6p4plc0atl6797gh3h/75774468652.pdfIn PDF document text
    • https://papiratisk.cz/soubory/fanipot.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160892c448aa24---kerixowafuviwikoxosajiji.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/detagoxorenosukewap.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vogulafifubuvupagafoxup.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/xuxigojamota.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d81c58905a---45219373053.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/87271598208.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610734e0236c4---2047014060.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/javowafegeb.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xagogigogazujedaxetix.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/45201240859.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f5575af68---wulosadapopowenenijivurag.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160810859e1f75---zamavumoruwawadax.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/wuvefogewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cbse+class+12+semiconductor+notesPDF 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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 10972 bytes
SHA-256: 1473d75dec2ee73ad8aefe2a9310fedf9d8683e655ac4455b14478979b966d1a
font_01_sfnt_off0001046d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046D 17860 bytes
SHA-256: aaf9e4683c4a4c8257285dee81a243a29f4ea51e1468a52ef25c105eee96ee57