Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed1bcf50986c5ad…

MALICIOUS

PDF

80.0 KB Created: 2021-09-15 21:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 83874693b45a4a2b57f01db4c81342e0 SHA-1: 1ed437647555e66b956550f58ce4b031a0b79763 SHA-256: aed1bcf50986c5add7a79ef3af759c8deeca689e221e3d23a0cb843363e11b19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://irlanc.ru/uplcv?utm_term=android+get+image+from+gallery+or+camera PDF link annotation
    • https://sherwoodchamber.org/ckfinder/userfiles/files/jawegaluzazo.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/9614820879.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/liboti.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/35773217692.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c4d5eadc---67378326842.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/sepesar.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/33830797382.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/62097575363.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/11128651867.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210912_193145.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2d6dd21b2c7d49a7c27ad3331b6ef217/34889979997.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/joxapobituvunuxotifomub.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/28952839091.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gumidosukovekolejagepe.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/cb222d7911f0f7352e79f11a23e7b786/84634571054.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pexagod.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/25156756192.pdfIn PDF document text
    • http://ruresept.ru/files/file/36256220854.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/22645844637.pdfIn PDF document text
    • http://lovesenergy.com/file/luxulazurakalofitimeda.pdfIn PDF document text
    • http://industrialdevices.in/uploads/66989510479.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/18483037140.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/lujifunifopisesedos.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD432 10744 bytes
SHA-256: fab6e1e721c3b89a395dbcb8c1c18d867ff8a9505dd65c3973c0a7d15cb21378
font_01_sfnt_off0000ecb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB5 17248 bytes
SHA-256: cb60d4b60aef4637e9527936e27d83db92559ade1b57ffcdba0643c81770c1b3
font_02_sfnt_off0001199e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1