Malicious PDF — malware analysis report

Static analysis result for SHA-256 25deb4cfee5cdc98…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 08:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23f0452e6c388bb12bb5d98801a7e0d5 SHA-1: d7af998494439aed979e911b6eefb5e507b074f9 SHA-256: 25deb4cfee5cdc98e25770817b1bdfc3ca9c6fa14afdf44d3f480827efa6c6e2
164 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, leveraging compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8973d6c0335298c5a94fd4c306f7b56f/80209483013.pdf In PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/0c09707af0261c992719de2ead7eb159/jibadix.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a72cf6edd5---74746578816.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/f3c52b06cb04304bfacbe4f30f49835c/36216582965.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/qjak2bj289692qkrl6tbuusta0/81064914887.pdfIn PDF document text
    • https://vpntraffic.com/upload/files/jawamikibibonekuzixu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b875bea2954---ruzenewap.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/75526557537.pdfIn PDF document text
    • http://samtekelektrik.com/files/lefuwenigezojir.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/51746764802.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/l0t1cjl1duid0olf7qghh2u590/9887900206.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/bapowetonobikaf.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160eff78c46ee5---ledupogidotiwit.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18001dd1e---vejolegapowetufijopoxu.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/binejidimizanixa.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/484da123301532164a8ecf4180b7df18/xixivelukon.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///nadowufizeropuzakeful.pdfIn PDF document text
    • https://olterus.org/contents//files/kapubiworibeboruxisozalej.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/wixevifaz.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/jajigunukusetubudidosu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a819fc0b5ec---10334133360.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/161079dbc33c0e---48020153587.pdfIn PDF document text
    • http://eventechsite.com/files/files/171365582.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/840476849.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff30dc48b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pub+quiz+questions+and+answers+2020PDF 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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 17872 bytes
SHA-256: 9ffd9ec2251647915fb9ecbf4674860fb831d6c4d6a1686d52aa8b25acab4425
font_01_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 10968 bytes
SHA-256: f0621180763f439ab75fa0d12c04070aa774721188ca99dd448df5387f675725
font_02_sfnt_off000139b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1