Malicious PDF — malware analysis report

Static analysis result for SHA-256 57dd127e5c1331a1…

MALICIOUS

PDF

85.9 KB Created: 2021-06-27 00:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8e14a5d3bff14d2344c8c00c668d647c SHA-1: 6a6b8c5bbb0174127fe9573246aa014c2746c725 SHA-256: 57dd127e5c1331a17fad92b03927d543519fd2cbb472e966eb39ce9cc03590b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The primary attack pattern involves leveraging these links to potentially deliver further payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://temple.mo/userfiles/file/juzazolosurinomenezitit.pdf In PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/luluzijikopinenidezovix.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e6d04a99e---98786318823.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/81qrash4s4pqldq4dap53vtsa2/51776661273.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/wasumutudevusatemularobux.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d56fe5c7bc---somonovawowekup.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/jilawatavomisatotujida.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608460419fb0a---82692014358.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/24d15e217f5fea780ce398d5bdabf2a8/zezesetabejoju.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ehvv43v2l4i4n3sflitehiei4v/nujuwatogotowogenajo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a60ec4f5b---56353611852.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47b60a6402---83295825468.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc769d7012---4618451926.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732dc1c8ffb---70380368672.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16073c959a568d---7942460911.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e499676f31155b7b900d976785f7cd75/9463469905.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1ae42e01de7d3ba29703af2b7f19fcad/xidapinenetasoziwixutotat.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/mipufurubupufojavo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/56d2578e1e912de1d94cc8b41058d0eb/1981220708.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22646067228.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/t8egn6bdci9g85ooueqh33u8p7/56093267651.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/rovopanimiwadigixifow.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ceb20c48014cba3f22a0a029757e7031/relamok.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/72843134802.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6e5fda28a---97931252612.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8fd590fe---jilanuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=plymouth+meeting+moviesPDF 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_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D9 10576 bytes
SHA-256: 0b3b695a9999dbba03127e9807d383c50c7f9261113e98d0321fd90eac99ab60
font_02_sfnt_off000119dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DD 18512 bytes
SHA-256: 51dd2d47eb84483ca44f9e9628af2c4243eb79c02cf9208bc72edd78d2326eda