Malicious PDF — malware analysis report

Static analysis result for SHA-256 41693796f8440300…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 15:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16048de2d84cdf448d46e5906f0bec40 SHA-1: 81828cceabe0efa4f6e87c4fc09f6321120f0f89 SHA-256: 41693796f844030050c280f748246c1e4cfb346dc387426e061e4d66e12a141a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and link farms strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://allytemp.ru/uplcv?utm_term=freedom+apk+premium PDF link annotation
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614367ae19a0d---toraxipuwer.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/satiwobupema.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/14797784524.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/verifo.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210923205745.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149554fbb12e---wiparajanasidoxopabub.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/zipevilavawoj.pdfIn PDF document text
    • https://blugarden.eu/file/sigowopigija.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/970j7tnsf5jh95u2nr6skkj1tf/wugavasedo.pdfIn PDF document text
    • https://el-tall.pl/pics/file/79547295570.pdfIn PDF document text
    • http://vititanon.com/user_img/files/82141993641.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/gorekerufijopo.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/58a88c482e9f764db37bd4a13d466d71/vuzikisisizesubedijudugur.pdfIn PDF document text
    • https://dental-essence.com/admin/userfiles/file/38055991120.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/ziseludi.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/57154453183.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0911/e13ef7e33dc73ab913acd73cd042413f.pdfIn PDF document text
    • https://landviewdesign.com/userfiles/file/juzaki.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/34201382120.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/62769392902.pdfIn PDF document text
    • https://stotex.rs/files/wizazafonafogiludozup.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/85820716776.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/17307675847.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/fusunegaramegodobos.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b4453e03d093319251ecce7b2ed549b9/fozutuxexiwifaburojoni.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/53215420499.pdfIn 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_off0000b599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB599 15512 bytes
SHA-256: 459ad76633920f52cbe38718870874265c9e760db624bd81dbda169368b3243e
font_01_sfnt_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 10304 bytes
SHA-256: 0766891411de8f8c95411fba6a4be7fc3804c4d346b95661fd673095ed8bc1ee
font_02_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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