Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acc5a8180eab093…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 08:28:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f1fc7b0201d75a3f1a0be79ff6317c63 SHA-1: 45725c18fbcd76afd8bef1373821ac3c7ed02ec5 SHA-256: 7acc5a8180eab093bc2aa5c28e32111e011b7f6164a2e9d1ec27ddc1d5546a8c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, identifying it as a phishing trojan. The presence of external URIs and link farms indicates a potential spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://simsvizag.com/contentimages/file/pijuv.pdf In PDF document text
    • http://geometrarontani.it/userfiles/files/56117935497.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee6b2959a5---pejik.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/10168527162.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/jutagij.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/lojotesapiwo.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/mijarakikenuroz.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/18311580835.pdfIn PDF document text
    • http://congtyvima.com/images/Download/8367081888.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f15e7472d---70539885000.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcad9e9d10---dulogufilegekeweki.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/11717805023.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/tibatokiwomuj.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/613a661c4892c.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/adf93572f69e2a97bc05b687bf291c3d/fimidapadoribomasigazol.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/69391971412.pdfIn PDF document text
    • https://dom-titan.rs/files/banuwefananevabijipajulim.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/48130397594.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/zimizupi.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/8257405051.pdfIn PDF document text
    • http://rafaelokazakov.com/file/dokakefejomeje.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/wakepetofegavedu.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/batazugibufomaxumominoma.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/96311701228.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/panebuwitajikasakoxiji.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/velomup.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/6c47b9082a015ba1fccc491069c21f4b/64494212410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=drawing+apps+for+samsung+tab+s7PDF 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16516 bytes
SHA-256: de683d415ab5e1cb33d061ff88a5e54d4781b186f3c324a0483e06e4f9edc649
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 10900 bytes
SHA-256: 4feb984d213b5b27a0bf90dfe5cab87d6263482712a970195ef62eb18c474a8c

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