Malicious PDF — malware analysis report

Static analysis result for SHA-256 483ed2da82fd0ad8…

MALICIOUS

PDF

93.2 KB Created: 2021-07-07 08:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6fb4127006c50b2fa79dfff7dc1cb096 SHA-1: 7804479b843e3436ac483f710f0086546200f9de SHA-256: 483ed2da82fd0ad87c4d6b6e37e093fe8fbbdacbeed989cb9ceef2f25e27d443
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external resources, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/3dd2b8d8f0d9e64627d230109be31e9c/9266985731.pdf In PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076788184b90---xefokulagom.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/topajasukezipezanakew.pdfIn PDF document text
    • https://unosms.us/userfiles/file/gagonigosusinisizupixe.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb840b9ad---xobizesikuzitamugasakoke.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/zidipix.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b48bfa77346---rigojobisizeb.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/4k69tb5hfqo8un4qc6hkc1fjvr/xonijidexapodurevupefufe.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/tibazuvetularalinuf.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/62360232a8055bd6fab9d5e0a1c8d6f4/54048700377.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/lomigotofem.pdfIn PDF document text
    • https://thepainter.asia/upload/files/pogafekisujazi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/340a592a68db32fb2a55a6d0c82dbf85/50642545983.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9781073422---8987182188.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f6124fe1c---20737145790.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b23744d17299862f844763e0fc7782f/kivokurisekifivemasa.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/90720403021.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/72719566780.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227b8ee9fd---xolav.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/91672087903.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/panilogisolagisovixojovoz.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db894522f9---munigulademilatovefov.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094aeba92de7---nuzufavoligodotozojar.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/a73952641698fa7145a5499be12502e2/bimorefokedikaloxuwur.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/51908630474.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8cf7e942deb1132c64d054b939bd2a57/loxofu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53d5ae0b---dibiligakipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=community+hospital+oncology+physiciansPDF 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_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 17480 bytes
SHA-256: a70ab2b16a39680d06c13da75af95c46545a956d1aed9d4710ccd5798fff9197
font_01_sfnt_off00013637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E4E 10832 bytes
SHA-256: 74c8122a006ae94f1169edb1211675ac181f4c84617cab678874fb95cf9f5858

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