Malicious PDF — malware analysis report

Static analysis result for SHA-256 9466028da9fa35ac…

MALICIOUS

PDF

95.1 KB Created: 2021-07-15 12:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0b503628463ae4b81b56d5725d9914f SHA-1: 3cb025e8c98493a4fe1e50e4a7f933342493afc9 SHA-256: 9466028da9fa35aca681246f69e788de7125a8a381d2658c36c9f3cf39a51072
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution campaign.

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://aksusu.com/upload/files/juduliviwiwafa.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf502c796b---simezemediluzegusoz.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dac8ceabbb8---vulafogipidafovukabutajud.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757f30e7394---bikedi.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/b0a23569225232b327e317a57b479101/rilibubitiwer.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-2/20210502033102559242.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vgo0iuj5oimeb7p4kns9abjov9/xivatiwavuvukawuwesez.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/pn3iqvugp403mq2huojo3ffuf6/56923282110.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/koxobizerizajarefoxodo.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/vasigi.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/70523380938.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/nulekotabewe.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/90381217281.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088dd2cf0143---vowujuzaxudanuzutimegaxud.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711ec52da3b---59637417075.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160db7f2ea34f9---75924514764.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/sokamuxovikufunax.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/70883009736.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/vesesijabofuvudavigebob.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/38daue9jdkv30cl9qkpr9sqot3/13339381785.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/59092797607.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/nupevu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b34b6fe0d32---rijomolim.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/7524467088.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0b9b249308fde330892abeb5d42346f0/deviguli.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01813eb9b---62361980415.pdfIn PDF document text
    • https://dietacud.eu/upload/file/raxojinikolifenatitexezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+trading+card+game+2+gameboy+rom+downloadPDF 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_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 11100 bytes
SHA-256: 39904d4f00cf9d43fcf2fd1bbe4bf992ce08c712cecd3be47bc16f7449522ed7
font_01_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 17308 bytes
SHA-256: aeae58870275c4c6ec49ad86c0c3e09e72e7bfa1cf27a18436d6ae9e8aae64ba