Malicious PDF — malware analysis report

Static analysis result for SHA-256 144c3b2fdf412234…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 03:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8579df8bc6637e4ea068bf2817e6925d SHA-1: 9cadc2278be0bfe9a35e22f9c3c37ee9e7141cf5 SHA-256: 144c3b2fdf41223414fe846f5c40434010e400f33227054ce4953658f7de3b85
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a raw IP address in one of the URIs is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16140bf10e56d9---20759106530.pdf In PDF document text
    • http://oasis-inwaste.asia/files/file/36547999373.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/gadukumelinidulelago.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/74231503103.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/70858928538.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zewap.pdfIn PDF document text
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/rigawasikazuvudosebasama.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/kinorafavamavusux.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/33695684117.pdfPDF link annotation
    • https://mcsfood.com/images/file/43746488704.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/25542844033.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/jogazogipeki.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff4909d3d0---zujixanamokofepojake.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/sogagikebigab.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/wuwilitewumolike.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/lupukubezevusubatuvaxuzi.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/82462880001.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/kinalubibofowopagizi.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/gemufilataxesekamoso.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/rejadakusenepe.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/1519966821.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140773de2859---35855200717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=8+ball+pool+mega+mod+menuPDF link annotation
    • https://b2cdemo.tickets.com/content/files/50890634233.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_off0000c383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC383 16824 bytes
SHA-256: 26762144c9a2226b955f5b7d401d5320162e82fb543607704fb8dd447523ba24
font_01_sfnt_off0000eeeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10702 10628 bytes
SHA-256: aad41560c5c6fd4a2c3cd55780a0efbb71f24d345dc67896b63c83d56e1888de

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