Malicious PDF — malware analysis report

Static analysis result for SHA-256 f662807ab4db255b…

MALICIOUS

PDF

84.8 KB Created: 2021-09-07 03:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 952d10378345e6b138bab1b0347b2b1c SHA-1: d5c66338e1fa420f3b40b3f376adf15f088a7720 SHA-256: f662807ab4db255bac6fdf9062a03696df7c59133876b4a778e120b7378384e5
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://bukharageorgia.com/sites/default/files/file/wulezigizizana.pdf In PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/31671907432.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/moxov.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeae08323ad---48046638476.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/71669602746.pdfIn PDF document text
    • https://phuquiland.com/upload/files/jugufakilavi.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d81f4eb4d5d7ac80d6a6eaf2a234133a/32040709341.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/93218579380.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/25224767975.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9836fd8a---55716719066.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a1e2a6711bd4d064345bc296d40056fb/44079542983.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/77918538691.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/23808039210.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/xuxufolepefujivopatawevos.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16092a98e3f336---sojuduzujis.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/xigasosovowul.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1336401cc4---25554100048.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/40832607714.pdfIn PDF document text
    • https://capecoralliving.com/media/file/tirenevixesixujinusavajun.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/sotiderebagufupadu.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/wujuguvejanugoxijavufiso.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/seresorekegarakejefazasu.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/22677082168.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/48456306857.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/57850005480.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/guvuvogabenenojepamegal.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/79411973636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=livro+o+povo+brasileiro+em+pdfPDF 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_off0000e298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE298 10620 bytes
SHA-256: 53744b534ef218a9d5ec5542c9551eb7ccaf32d1ef0162f136d3c937b247e91e
font_01_sfnt_off0000faa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA1 20316 bytes
SHA-256: 687623ce8533aab9f03038cbae6fc0d23290004f559fd1327798b04153846a6a
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1