Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c0e9b56ae063fd5…

MALICIOUS

PDF

82.0 KB Created: 2021-06-26 21:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6fe3538fb68d438ec1ead033d5232a87 SHA-1: 3f7ecb13717b58f87ec967589a34010c034767ce SHA-256: 4c0e9b56ae063fd508e393609b4bbe2e8948bfacb8506f92e8730dbb04e999c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely to redirect users to malicious content. The embedded URLs suggest a lure related to academic material, aiming to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=chemical+engineering+thermodynamics+smith+van+ness+solution+manual+pdf PDF link annotation
    • http://marketypik.pl/zdjecia/fck/file/82352892718.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160802a4f444fc---46953440690.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/r0pcvdc4b1962eucpqh6u7fhfp/34128641865.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/138f38f2c023fa9fa76a5d85c2fcfe81/gutusu.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a8ebe2aa99496791bf08eb6782cd1eed/49362056308.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609866c13bfb8---70934411325.pdfIn PDF document text
    • https://medtek.vn/storage/file/gumatonejitinilodoxomefej.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/pinamijas.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807e41b28a2---45478585901.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a240804ac9c---65713493521.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/696b84fe9b7fa85960d3efd7657ad850/vikepagaxi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67f089d21---lamerovidiburutigigoje.pdfIn PDF document text
    • https://landi-bg.com/images/file/ravatosevipifabalowerud.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796b0f97fdd---wutexajupinu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/filthn7umuv54ssetb0r939spl/gesopuregutibipox.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/39232855720.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/032bbc9010225d5264d7137364f887ab/vosukebifexadawadedevijuk.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/dagukejapozejesevox.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/dezuzosutovaxamegoreram.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5f673fdf---rujufezuruvujem.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c356f675cda---giripivawegapu.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/36384605763.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_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 20192 bytes
SHA-256: 394191e50691a072fbd5c6bbf360db86f1ece732924119669138dce9146b7517
font_01_sfnt_off000107bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BB 11380 bytes
SHA-256: b19710281e039fcd655c2dab70f40749b99478e933e4deae11d80f7328e6baad
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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