Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8824878b49ef1df…

MALICIOUS

PDF

69.0 KB Created: 2021-09-29 11:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e65a04576df9a0526a69a1c6f0038d35 SHA-1: ca94c1a4133ba57e8f99a74c8b31fcf3c7255849 SHA-256: b8824878b49ef1df3912eeff72efb1ea4ec893ec888fbfce6769ce4133291ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The presence of these links and the overall structure suggest an attempt to lure victims to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 https://catamma.ru/uplcv?utm_term=adb+fastboot+tool PDF link annotation
    • http://csc-028.com/userfiles/file/20210914183039_84pnt3.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/xukomovaxuwimew.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/59d01292abdfe97d7ec359e4a9ab9205/zuniwabatu.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161324a5f38505---46721112418.pdfIn PDF document text
    • http://momsystem.ru/public/file/kabolofejisosan.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/xakabazomururalivomefuriw.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/36100725152.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/munakasupifofel.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/68342525368.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/fesew.pdfIn PDF document text
    • http://mounceconstruction.com/userfiles/file/17590654458.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/fivuvilakoxa.pdfIn PDF document text
    • https://blogsma.com/files/36134834243.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151122f4e7a1---miporulusaxamixur.pdfIn PDF document text
    • http://www.buildonhope.org/file/lojejib.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/12284683617.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/simerabibojaleromiduludod.pdfIn PDF document text
    • http://ikansambel.com/contents/files/koxevobamuzales.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/nisokawu.pdfIn PDF document text
    • http://labsshop.com/d/files/23686987358.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/kotiw.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/loxufuligekuzesowolonak.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdda099dad---90931787918.pdfIn PDF document text
    • https://www.gitialiganjlko.org/ckfinder/userfiles/files/15223841511.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/bolinilokedodu.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb1f79e70a---55959609819.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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 10040 bytes
SHA-256: ee40d74b5a7d93c295c4f27c98660d9ea4dcc72ee6ba4e0741b6093f891f1e2c
font_01_sfnt_off0000ca3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3E 14576 bytes
SHA-256: 46f59f35984eeba59abccc77a20b6546ccd85689baa7b4f9e71517e8d2882c1a
font_02_sfnt_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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