Malicious PDF — malware analysis report

Static analysis result for SHA-256 021844c8c4306c08…

MALICIOUS

PDF

83.3 KB Created: 2021-08-16 02:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b992d0122bbb8d3016560e9f7a27eec3 SHA-1: cc06b38b7503165737dae87642aa04c9d1c685af SHA-256: 021844c8c4306c08b103b24cfe62a61adcf05b039ae398743cd0c98c5c7942fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites and disposable hosting, suggesting a link farm designed to distribute malware or phish users. The presence of external URIs and the nature of the links point towards an attempt to trick users into downloading files disguised as legitimate software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead38f2a51---67269050547.pdf In PDF document text
    • http://churchtextile.com/userfiles/file/jaxuk.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/88139848133.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/70ac9666be7af1caf5ca9f529340a951/rijotamelug.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/afbc1c168c71e84ab70ddb1b3a56d33a/goxanerupejuleromese.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/dofigorofeduvavofevowupit.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a9f3d65d0---87095776916.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/obko4r21c6o8k4s9efo4153kjc/65674040104.pdfIn PDF document text
    • https://bjsteelvietnam.com/upload/fck/file/sarubefo.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a44066af740---vivefuxigibefelofize.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/3f9c615fd108f356d6004e4ca888168b/mizarofemotizo.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/6027e83f15a9ff0ba1190b156686344e/59492181948.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31826f4095---kasegubizu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1cb132c59---soxikumarukiwunimusinugi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f04d8eea5---pimuze.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/91550846655.pdfIn PDF document text
    • http://whippets-au.com/clients/7/7f/7f5032e15db821a993a8146895416847/File/kixaluvixiponenazaxedo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/27e7761e299d4a93b00d4f82202c3704/18290680888.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/tenasipisewolo.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/91539272426.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/240f2fe8cdbcb3ad013a155e4bdafd15/46560643085.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756aab0489---21324105627.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/25691839871.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/degijuzen.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/lizuxosinudow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+corel+video+studio+free+crackPDF 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_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 16608 bytes
SHA-256: dde9a8f310dbf7e265d5c6a6df212611bb5bacb91a1292ed2adeb6424efafeb6
font_02_sfnt_off000123c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C0 10812 bytes
SHA-256: 0f4f92811e1d9dd8bce6badc2133233009ba3cb856a1a3ef375ea46cb4293116