Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d440496366cbae…

MALICIOUS

PDF

49.4 KB Created: 2021-09-02 19:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb7e16a441af5d853655ec485ec77610 SHA-1: 300e843a1363e47c6e39a917e9fba8a1072b0eb4 SHA-256: 81d440496366cbae44d3a217740a85bbe8b0c5d55849e21a7c2f0ede8d730fc0
154 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The presence of numerous PDF links and the overall structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8987

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://n2nlah.org/UserFiles/file/7687802205.pdf In PDF document text
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/51608988036.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/92bceb6474e380d728d9e57083473461/89155736094.pdfIn PDF document text
    • http://abpaluso.com/upload/file/nokafopivol.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c4b8e5b3---6306940802.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/df95b31e86949dc0a4c11ecb0c4db2c7/59733261181.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ca73c1a3ae00a33247ba0c1b5740f34c/pasojemi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/c3d30bf7703970bd3326fdfa653ddc5b/95575969490.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/7972955600.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/xubowifuma.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c0493db80---46855799775.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/buroferipuguxisiwodo.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/kovozup.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/09lcalc6q3ndkf2iitlol31stv/seperudanomokuvop.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807409b927d---sijamoxamojalen.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf51da8d---24169759030.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5232a3c43251e53945fcfb895ab1808c/faponuwes.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/vitefetifemed.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082925ff01fd---bikanarerewoladugupido.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/12476626031.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/fukazerozuzuridumikaw.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e68506e531b---bagadorojupijipit.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/rajirudadinijofew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=twilight+new+moon+pdf+weeblyPDF link annotation

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