Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f289bd85ee688d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-06 10:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36922cf048f1a3718ff7154407515025 SHA-1: 49abff4566e0163e0d6bff68e2aad650dc53fbdf SHA-256: f2f289bd85ee688dd5863a7b9a50d8899ab7db86c69250ac021601c29763bea8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The presence of 'utm_term' parameters in some URLs suggests a potential SEO manipulation or phishing campaign. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://landia-print.com/pdir/file/debasibe.pdf In PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/f5aa2f95918fbb695f07a79f1c372c43/lemomabunilubedegi.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c02ce1a25e16ba5b43c8019fead39009/riluxareborebil.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f240a9498b7---xiwireweretorudomubigew.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210619170051_g5v3g6.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/35750469392.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/4182624917.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/fuwulivem.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/42665615352.pdfIn PDF document text
    • http://carolinaboatclub.com/userfiles/file/xotafisotaxajil.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1vug9arb90pj0jpciulqgtkao7/25069660769.pdfIn PDF document text
    • https://efnnma.org/files/file/volokabinobagowulepu.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/62180877602.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/a3fc9c307cf0f2ea049b238d8a3ad0fc/53388559933.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/rovewiwufofeva.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/budemigovox.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/fitadimobajar.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/31941251744.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/2496b24934890e7e5d2c8698d572fc69/47263304912.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/34205252534.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/7d17b2f4a5afb0f00393491903a74c03/77683083265.pdfIn PDF document text
    • http://hevolta.com/upload/file/jedodasopopifetevekogijuz.pdfIn macro / runtime command snippet
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102bc64b576a---liguxazadisexedijokasudu.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/rizasipos.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af7000f76---62864438031.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/kejazubekevifisani.pdfIn PDF document text
    • https://www.indee-r.fr/In macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=free+water+cycle+worksheets+for+kindergartenPDF 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_off0000f001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10813 18844 bytes
SHA-256: 130cc8cfceb4988a624d824ccd96d2f7e4de5262723e95dba03053bdc306124c
font_02_sfnt_off000137fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 11024 bytes
SHA-256: 8258cbe0f3a82dac58792043a5a7ef87f28345d9d412ef8b9e4023935240e0cb

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