Malicious PDF — malware analysis report

Static analysis result for SHA-256 8163a94d630a81d8…

MALICIOUS

PDF

96.6 KB Created: 2021-07-17 01:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b5f867111db18dd18d59b6ad89128b55 SHA-1: 01ed9be8a70640d081243060185329aca7d59ab1 SHA-256: 8163a94d630a81d81d65b431c38971863c2743f9a959a1f04bbc6e3f78686e9b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9857

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://baobihungphu.com/media/ftp/file/50409152722.pdf In PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/88459879397.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608650505846a---67251504654.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/fufogaralugadifebun.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608364b3565a7---gapazarinub.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f396c464155e5ab2c1b0b4d7befa2ccc/selomuri.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/50tj9ok9vihjouj1tn6ij6evuu/wijemolapitosew.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813b2795fd5---81583896160.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/incu5ncb304qqdgn82cj06ij58/vigolubesezupeni.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/faffe03c3d8b73db83a48f1763dfbbcf/92418977584.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1865d4fd40---9672920773.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607481c645a07---bukarizanikitesewasafem.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/55439348957.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/irc81hm1dljv7hdg3i47pn9d4q/mazog.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/31573479133.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/xixubudemalevivofos.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/18060775787.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65d43126d0---lobumaziw.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607006fc1c91f---65542690466.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/nenakuziwoxebixuvixu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608573948974c---xegafitupu.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/jomujagotelip.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d47dbd69---33654784448.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=admire+meaning+in+swahiliPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 19852 bytes
SHA-256: 92a7d9cd3d26f8da558a8a0e3b5a8a3ff0952699dd09202cdf330701533aeb52
font_01_sfnt_off0001207c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13893 10544 bytes
SHA-256: a49bfcf2d5dc376533e06eeea283e439b59d7b05d84656191e0b373095d936f7
font_03_sfnt_off00015024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15024 2508 bytes
SHA-256: 0ceccf293535730211feda0fb6dc38c0601f456558af1183b1c4d1e499f95636
font_04_sfnt_off00015aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ACA 17192 bytes
SHA-256: 8bbed2aa794e9a33a780745d3399dfe1ef65523426e14a7f9395138a27e9dbb3

Open this report in the interactive analyzer, or submit your own file for analysis.