Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a32159a0157455…

MALICIOUS

PDF

83.2 KB Created: 2021-09-01 03:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b60fff171df92cd2065cb3288fcef10c SHA-1: 0d242b741bbfc6b9bf1fef138327db2a3f3c87e1 SHA-256: 48a32159a01574550be1a40f4d458ec30a3ec9124a8492560a9799d7062e2cf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous embedded URLs, including those hosted on compromised WordPress sites, suggest a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://infrive.ru/uplcv?utm_term=candy+crush+friends+play+online PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f33f025fc---lorusekedupepu.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/nesivopasupagotozakekilab.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5ad8b353bed013eb42838de8e9d26a80/gugefisagemegepusafo.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a79615493---tokotodekidiwa.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c62cfe4911ee5517a952c66a4a499256/63126291850.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/naxoruwojokixejufarapuxu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1141eeeba---96274317799.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084257f65139---52809794691.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/95899625008.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/62689192811.pdfIn PDF document text
    • https://partnermind.cz/images/files/deduzejupuxuximek.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/kowuxusirufekofofabifokuf.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3b367e829---dowekiwitakekom.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/44980017561.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/kubejisiziz.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/52185655631.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/29184806652.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/8d2b2d40f2eee29df3c8023d4d34d49f/7110331588.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4bf3621f2---18213082122.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/fc46ece1ce9c2f1042f9608f37937b79/26036621271.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/gikusesuluwaw.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_off0000deb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 18308 bytes
SHA-256: 5f18c901e7529b8ccf95d88e442c1a132eadca0147492c1b7704055457ce0fb7
font_02_sfnt_off000125e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E9 10864 bytes
SHA-256: 97eaebfee338b0205683e09d0ab334693a656753b6669abbef074944ea12f606

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