Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e1b39034de4a6b4…

MALICIOUS

PDF

72.0 KB Created: 2021-06-28 08:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a0d48a5a93abc9107581e86fffb9157d SHA-1: 18f3f45ca0a8a959af2d5538293abdfcc4748d3e SHA-256: 8e1b39034de4a6b43301ca6bdff5ad12e782a58c0a69fa63fc520033433ba8e4
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6717

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://beloezoloto.ru/userfiles/file/45737913315.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c211e7eaf---10599326234.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/69d889fd1658e164cf937a09918c634c/mijigumu.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/67747750872.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076834d1c981.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3be30b61154f56d4f0b7f8fa06f28e62/56821933630.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/95013538764.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/julozuwosizidegedosumu.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/29361348756.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788cd694aa---15923936589.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8a392b66---kesuxoluxebusaxezevipaxu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/fl9ipd4hv0q1p2ptpjhdi3emfi/jobovotunile.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/76376702e9878e36fba0ae06da278856/tivevaduvarigiwububu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/8240322976.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a881d678f35---kativuxixuxobiwa.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/akl6bmbjpe9qd8nbhf79st54er/zugebabibami.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/65941939817.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607060cb5391d---46257151524.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aa519d9ef---12592985702.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/a54n9u10kjeti5vu363lviude6/26613978478.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b918aaeb---54132047219.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d397409d6eaf48f8e5cf64d7b4e64c25/vetozeroxariwibulinef.pdfIn PDF document text
    • http://vejwun.cz/images/68716698512.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e84129519f---57362524744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=handsome+hunk+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 10632 bytes
SHA-256: 1ede5b6f2ab2bf3c977b830b5f917ee3299da865ea145c127db2c0ab5a1f7b46