Malicious PDF — malware analysis report

Static analysis result for SHA-256 f30d0fcb58d4f66a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 06:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ccc2901120c4d3738ec2b57c48bd7db5 SHA-1: baca1c976a2f46d54caa98a69a0fd85decf9f336 SHA-256: f30d0fcb58d4f66a8dbc46b09dc1b9a4ea130ca1aa86274c3262d54e67d34e0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources. Several of these URLs are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to obscure the true destination or leverage compromised infrastructure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hexindechem.com/upload/files/vimukokutivovomijazepa.pdf In PDF document text
    • http://juncheng.tw/upload/files/5354232797.pdfIn PDF document text
    • http://vecsecity.info/editor_up/58042940816.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b375c98fae3dcec15757423aacb00934/semubonasojesevo.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/wasewizupesavebuwukabojez.pdfIn PDF document text
    • https://istanajp.com/contents/files/80476140228.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/54824086339.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/wozijasij.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/76033294892.pdfIn PDF document text
    • https://myreply.mobi/snappshott/editor//file/45651515849.pdfIn PDF document text
    • http://yoron.net/up/files/46663243396.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/motapu.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/pujefuzimawikira.pdfIn PDF document text
    • https://cooperspick.com/files/jesiwatebono.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/lajegaxun.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/gedazegukus.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/1010818979.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbd97d29d0---zabupemeliret.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/76762539653.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/8822787598.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/marusobudinatabija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=vidmate+apk+download+officialPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ac9379818---xaluzaxiwegodo.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_off0000dc33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC33 18468 bytes
SHA-256: 1ec8826a0925b9e87bb128abbd4cd4bdc325c856c5baf9a849a3ba5bf48fbd6d
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 10660 bytes
SHA-256: 5b8bb117807b507bf589374c8c07d621202dbe309d9e06d7153549b26993843b