Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c4a9511fd6e717…

MALICIOUS

PDF

91.5 KB Created: 2021-07-13 04:12:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d2613419be5d356eb2d26234e4407bbf SHA-1: 9c500fae7aea55f0e6c6e24deadf1bb03f0a96c3 SHA-256: e7c4a9511fd6e71775ceb2112df9d9c250f314d98c1dfa7e25dc629b8553b49b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and link farms pointing to compromised WordPress sites and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=inequality+for+all+documentary+transcript PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a8be2585f86545045d66f469b3c8469f/64992984449.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/gudoxadekafogadadoti.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16078c69848e2c---woxaxejasutatimuluzuvide.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2df683cd0c6c234d5dc1f92efbb9ae1/9748478343.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe31e0513e---toleremomip.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/wotesukiwabilinotepoxoxek.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/74426015337.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/31d89b155d440c0478d6856ae3b9b98a/78048691094.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09b52fc03---6380253592.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/2h8nqsn3notdknrdi2u8082kef/gatizebivopop.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/57eda1b320a589c89a493e30822a4dd8/xomavotigaje.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cgbk9dc4jg6tqvtaevqcp7ddef/mimatusonafem.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/1pgmfefpnt6aghtsk3lm7navmo/gijemake.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/68985724492.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sulovulefuluwawivu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5adc42a31551dc87552d09edb3a71e49/64127475511.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/amaqat5big8u47f1vdmmbuqu44/53439369396.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/1be5726f11b3439a96ee402f3023934b/samumipisosizo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/83q03q2vmr13glol8b6rj6l3cu/14330306605.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/10364001364.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mujutidujafojefe.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/48167602868.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160dac7dcd28c3---rukusigegu.pdfIn PDF document text
    • http://12shio5.com/contents//files/9179581573.pdfIn PDF document text
    • https://storify.com/laurelhitchcock/studenIn PDF document text
    • 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_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 17520 bytes
SHA-256: 215b377e36c2e7985e35229c89e235c8ed4495b6ccb1518474a4b85fbef903f2
font_01_sfnt_off00012e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E98 11092 bytes
SHA-256: 49d8bde5fb8dead44ca692a7feb1605b4ae61f6382b680bdb4b2b1dca97abb4f
font_02_sfnt_off00014841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1