Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe0c16c0d5b0868…

MALICIOUS

PDF

87.7 KB Created: 2021-07-23 01:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3f6f58346c882310e2a1674f28fd6670 SHA-1: e4c06233eda33968a8926125a0298bcd71b92032 SHA-256: cbe0c16c0d5b0868e5d35581850825855efd3f16243751942e21c9baf4828dec
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, indicative of a link farm used for phishing or malware delivery. ClamAV and ML classifiers strongly flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farm heuristics confirms the malicious intent of directing users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://arab-hams.com/Ups/files/totajilatokegavew.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5202a3b2a6---5044622142.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/o97bmfd91dlqu5sbaj7emu6o85/wilaxojuwajabonile.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/wijiwo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9f7b4f82d---zarowesozitinifizolos.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/likuzopobarugonowid.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/8esjlv1dqonv4o2g33o9dnfqi2/lalodozilulobevak.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c712de88f51---wulomikujuwibebeku.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6c815cf1d---radiwanilixuguzugizewog.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/rerukalorowifu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/dca658k35ua0r2bugvtihda2if/40242499730.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/jinud.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/65547549502.pdfIn PDF document text
    • http://gibisch.org/files/files/zerurerosifatorirukug.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0287d8acb---43403854283.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cf899062d---xobegujisuwuze.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/51785859c350b5f7872f425ebb1c2979/14126986886.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/ruxowigab.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/665v8196m0libhlobf90jcl61g/12400376615.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d234c1e526d---tununaseben.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1b29d477---sovolum.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078df52c8b31---ruxepamapozapudazalasuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+windows+10+enterprise+for+freePDF 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_off0000f308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1F 10716 bytes
SHA-256: 9a00f232eedb7be643e08323bf388be54e6ff201ca7fbf4644942286c3ee6da7
font_02_sfnt_off000123ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AE 17348 bytes
SHA-256: 3b6a8aed8c3e391550620d603f0b8af67b1321affedd5c9fbf658b4ca5ef717d

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