Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4297017a27f56ab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 09:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf1fb868d31d1c6405d587b9369eb046 SHA-1: fb1b5d0a72870735aa6700b837f8bbb6c213cc0b SHA-256: a4297017a27f56ab2b72fcfa59ac918869bf186deae20686f0c627f3cb084b9c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The primary goal appears to be redirecting users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/91vvphj04jbcs8ocgl6h710rvn/kerojoduter.pdf In PDF document text
    • http://yasairamenbar.com/uploads/files/19375615445.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/8292815559.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/20584161397.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/pk5fsmvmm1llmbb467iauql029/muwejafe.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wemefokumorexinalubux.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/worerad.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/678a9f284425ab9d127614f336d27220/titubesurofujijexi.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mipojavi.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d402460401a---87758044679.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210825211033.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/rebulebejivajumev.pdfIn PDF document text
    • http://vswet.ru/f/vuxuzudidikobenuloga.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/15899226123.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/e392864c92780e16f1ea0e00cc6ba8f1/83499985326.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/86737632974.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb212a52d4---63025843920.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/3606c53a013f29e928c487a1c37c6e23/vuwumeferemikivaja.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/20136473902.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/79784633838.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/05a3c7da6653b0317315ce32fbb9cf95/ratotezupavufafejizoru.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6fp6ehn2fvmmb5iuiig07hm69b/83637177158.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d73b1d8c1---xazevaxexuwusigavamek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=rectangle+shape+worksheets+for+preschoolersPDF 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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 10892 bytes
SHA-256: 9cac60e57793b73513cb4ccb94e2f01049aab4980711077062b2b99afd11400d
font_01_sfnt_off0000f4a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A5 17828 bytes
SHA-256: f06d00963dc53f849bfbe277768adcbd3fa476ff662cfd3468fbdb3dce57180b
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.