Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a32d83d1156ab85…

MALICIOUS

PDF

83.8 KB Created: 2021-09-03 18:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0970d7d04acdd77db384f48605df79de SHA-1: 150ecbfb75bb0c6c32c428a97ad9e7c2cdf009a3 SHA-256: 8a32d83d1156ab854259e4ae14e9ed7e45a831b67e525badae745b6b986f41db
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb2d635c98fbeafe1518c967a4315b15/97762591066.pdf In PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/77302355081.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a1c03dddfea9a18c928139297b15da1d/61379644735.pdfIn PDF document text
    • http://aimic.com/userfiles/file/dorikapedavidarib.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90717bba6---96168703163.pdfIn PDF document text
    • http://snft.ro/media/file/59131974465.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/87231886705.pdfIn PDF document text
    • http://barnesfamilyconnection.com/clients/f/f3/f37d50667a1bb99e511e26172889fab9/File/dojavadewavapiwenozaxagox.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditofabilowapawu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/kmgdubsqpklmr60s1g6gjh9hus/18477532008.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/67940375980.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b33484d476---47522192160.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/1824232205.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3c2e8903872f17ebc3a2e039023ec8d6/51893888004.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/vipalagijida.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/be6f05090855b5136cc69ba1f91b5bd3/9295121191.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/fujekepiduseponagitazax.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1e69485fd---19097016494.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/c3tgg8r3k3so9dp2qjn1guatvn/guzitelirebixusowakib.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/92752582696.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082d803a0bf8---5563473512.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/5171d3ca42e5dfee64886e256f339bc7/96144771417.pdfIn PDF document text
    • http://bookblog.kr/data/file//files/tigoredilezunuvinijugeva.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/bowig.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1565b0fc3---vajevagipijejawovug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=calculating+speed+time+distance+and+acceleration+worksheet+answersPDF 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_off0000ddfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFC 17728 bytes
SHA-256: 7aa67ddfb17baceb980dbbd8ebf244216983fe5dae12fb53ae06513bf4b46e8e
font_01_sfnt_off00010c5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 11268 bytes
SHA-256: f24dfb19b345bfb33396b68ab2f7a8e8feaf1862950585b5ab15a1e987ef1f95
font_02_sfnt_off0001267c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1