Malicious PDF — malware analysis report

Static analysis result for SHA-256 a49ff7d2fb887cb9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 06:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a589c1960a0010bfc00cce3b92fcadab SHA-1: c689242dc5b3edc3b68c63adee5a100deb1f572d SHA-256: a49ff7d2fb887cb930b1e909a84ff09f823a36028c66691ffd4a672b3da985b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613866aa637d4---virelovezutejujixivogu.pdf In PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/66532748927.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/949f9aa8cd6935f17c4a82d92f18ebad/11267523510.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/jagewukedorerifetijofiwa.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/19969311690.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210918_F23715DCF99A0C71.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/65243984995.pdfIn PDF document text
    • https://yasacompany.com/upload/files/10594625171.pdfIn PDF document text
    • https://pratham.one/file/domekudupoj.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/pekitutipawepido.pdfIn PDF document text
    • https://hssanesteban.cl/files/27067332824.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/kawejejotelitodufuwogudek.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/eld6n1ts6cfs7igead4b4q4c71/48344326726.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/30421601573.pdfIn PDF document text
    • http://elskenecologie.nl/files/rurekisolajerexo.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/nuravaxafezetekidirip.pdfIn PDF document text
    • http://kustari.net/userfiles/file/30555350146.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/lidemofufovegatexigewir.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/48388403188.pdfIn PDF document text
    • http://elpijisystem.com/file/damatapojiwabagusumagawo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff81211901---zorojagoxalipuwu.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vepabotikinovitanujilaz.pdfIn PDF document text
    • http://szwygs.com/upload/dagefarovolaxiburewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=it+chapter+1+telugu+dubbed+movie+downloadPDF 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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 16924 bytes
SHA-256: 79656542256be0d89f86437af94ecd40e5e71bedb7d3ea0b7256f2936613cb52
font_01_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 11188 bytes
SHA-256: a80ec0cb2589ceffcfc9adabe7d217de8f0c5d9c79ab1abfd84fa841a234ecac
font_02_sfnt_off0000f9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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