Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9aeb99e819a5bf3…

MALICIOUS

PDF

81.6 KB Created: 2021-07-07 09:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f3cdf02b240b0734b210cba13934de9 SHA-1: 63a853d6cdf25e7f2a1f269397fdfddff980e8ae SHA-256: e9aeb99e819a5bf3414551b75a3992e64d951280633252654dfb19c977c024f8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://autoandtruckrepair.net/nbloom/fckuploads/file/73335175199.pdf In PDF document text
    • http://stardentalcare.org/userfiles/file/98979097992.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/27520266016.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/pubegifejixi.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/fvdv80n0krfj9hgj607ma92t9c/4464462767.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dd203b5acab20359b4d55f7f3c04d587/280458624.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/93844975886.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/602a3c07aaeb45ca928923c9ed85a61c/69274488265.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0be7581ef---jimijeva.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/24973549292.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/tubanuwitad.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee4a8447bc---nulagunexirilisudozira.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/31070904816.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b59be8c1ebf---99876420607.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c039692a654---37258366883.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/kojurizolagadibazekadab.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/savufilakifimuwolezamabi.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd01303077---93588601928.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/5612368513.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/21969971864.pdfIn PDF document text
    • http://cobbpaynefamilyreunion.com/clients/862770/File/lizupejad.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160750cc03b4b1---39681179827.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/nuzodadekamemozub.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/74729555072.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/35120601323.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/regenumaxotugape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+all+this+time+alwaysPDF link annotation
    • 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_off0000dbf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF4 10604 bytes
SHA-256: 2863486d7efb21ee91052892cd9cc13d9743335cce402039259eac96ea55cc86
font_01_sfnt_off0000f435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF435 17092 bytes
SHA-256: b001fe4d3f7d0d9d96982407738353b07259c246630105b0f6a5e096921ae52e
font_02_sfnt_off000120cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1