Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae79f0e19d217dd…

MALICIOUS

PDF

82.6 KB Created: 2021-08-03 02:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cbf7fffc1a69306584635dfad1782a6d SHA-1: f48150906eac3d6cdeddcfa91b364dc99fe97219 SHA-256: 7ae79f0e19d217dd89d311bc89c9b59d865b40d773a7cad59fa69ccc721baa30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=aumentos+y+disminuciones+porcentuales+encadenados PDF link annotation
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608d031c49b4c---raleworesesurorisupas.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/68023561995.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa0a4584d---18674571701.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/dasinakuroluvupoduvone.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/auhvvu829r5c6osc1a2djpf3na/kigegeti.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/jezulasunibami.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7dd3d234842e51f36ccf1cf199710cf9/9370644385.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756df5c4936---70392724991.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/65594063554.pdfIn PDF document text
    • http://esejsc.com/upload/files/gogunoferulipupuruve.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084560f4d648---68821864047.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b364a05024c---59458249117.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b65fc36ceb4---sofejiwubemop.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40f30d8ac---58238769245.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3fb2d0ce1e8963e01b282abfcc7a36dc/93505923533.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/62662882220.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/64959950415.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/38076720751.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/252b507f7bbfba08a0ba7cbe98d464e5/61265667675.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/kefowezuvokulawam.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/lonevinuvabu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c75f51a8b89b9a94af49f93c232431b7/xisopitugup.pdfIn PDF document text
    • https://techlan.pl/files/file/40970042473.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/zakumejopikogal.pdfIn PDF document text
    • http://www.polni.si/Images/files/poterimugex.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_off0000d93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93C 18848 bytes
SHA-256: 93b1cf2c55d9b85f490df9025bdf5962757d1255fada874548a036a0f354047a
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 10872 bytes
SHA-256: ceb4f1dac8ef59e979e54e94bc702edc9a1828f4a756b10d8441269bd0545d9e

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