Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8782a8c9e1c02c3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 04:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9a8e62cb561ae0674a50f050149aa8b9 SHA-1: adecfead4d84d73d5f1223eae178db48219c6387 SHA-256: e8782a8c9e1c02c3cf53381051e287d8054de3996a88b85b81e23814a925054b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=avengers+endgame+live+stream PDF link annotation
    • https://milsagliksen.org/upload/ckfinder/files/wuvegunulin.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/tapilupobif.pdfIn PDF document text
    • https://educhina.mn/editor/files/jujutuzuxonuguwo.pdfIn PDF document text
    • https://umutfm.com/resimler/files/60205761889.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/mupedofivopekevirezolizel.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/kupazaroxinulejirama.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/mufesewogasaropufad.pdfIn PDF document text
    • http://airzo.net/userData/board/file/96308704003.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/62316146244.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4bfa57f39---56538616554.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/91449769647.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/pukekipune.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/54957e11db35fc8c211f8b7151605a97/nizikexoxinopifororurib.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/14677091856.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/wuxanezimozatodadurefif.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/zomegifotesobevetol.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/54064818139.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/51215168570.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/88604544931.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/25140854017.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/98136416492.pdfIn PDF document text
    • http://one9five.com/userfiles/files/vabejemonif.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/17ea85923f4466d39a8e8c8791cfd984/17330287797.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/dalujuriwejenosumiziri.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://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_off0000e2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC5 10516 bytes
SHA-256: e502d256df9a875f7c830ec54463d64e594715236038b6850d1f1623d54a6deb
font_02_sfnt_off00011280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11280 21196 bytes
SHA-256: 6ea0f35216617ff3febf4fac16fb14f7e636a538de882251eeb850475da51498