Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c20a031f35eb6c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-19 15:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 53ae628b5d685697961f9470dde25e19 SHA-1: a18909f23f02aeb5f763cae3fe7ca5cb65217c52 SHA-256: e4c20a031f35eb6c16b6e8afd396b523f629acdc059e95d87ad504eadb51dcd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, directing users to multiple external URLs. Several of these URLs point to compromised CMS uploads or disposable hosting, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiorapizza.it/userfiles/files/kawuvudujuvulebogebudirip.pdf In PDF document text
    • https://biserica-izvorul-tamaduirii.ro/files/jipopuwulotenet.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/doxuvu.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/fixunilubaz.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/b51951f1279e3c2147839c72138b7471/bagida.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/bukam.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/de9408d564b3ac55c89bff38568be331/vupebalixejiwobuvaxofo.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/73528490201.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16146a50dba79f---4278010743.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210904_72DBE829D818EF1E.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/86638351735.pdfIn PDF document text
    • https://coil.hk/upload/files/bewigaz.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/fibemum.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/bumavigitodefobimilonu.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/forapisof.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0174604ed497a84d593c1525046b2c62/20555859684.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/53646496173.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/bujimojifumobovedebe.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/wewozukojiw.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210914_95D7CF5B79F7FB02.pdfIn PDF document text
    • http://vit-physio.de/file/paxetebugewoxitigiziki.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/80232844566.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/97080005122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fifty+shades+of+darker+download+300mbPDF 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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 18944 bytes
SHA-256: 956e173387d6a635e9fe088f997d84e0e2f4295da25e520c4ca5fd1bed77197d
font_01_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 11324 bytes
SHA-256: 64862038d72681d08f86228ac20403191281bccd4c294625820e73916ec33594
font_02_sfnt_off00011cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1