Malicious PDF — malware analysis report

Static analysis result for SHA-256 83963551be5d1a81…

MALICIOUS

PDF

85.9 KB Created: 2021-07-10 14:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ea9665d8ae3b7939fc36442680cabbf1 SHA-1: f3924e101894182fc441dff7d1664af86c35adfa SHA-256: 83963551be5d1a8130f30eb1e49ddc5d7502e23c399e8a804c750aadc1b7389e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a common attack pattern for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/rejmto1grqdj2r6cm7ctnarqq2/40493295036.pdf In PDF document text
    • https://ajur.rest/uploads/userfiles/file/kemikedoxedofadigemupoje.pdfIn PDF document text
    • http://fxmeat.com/upload/file/a9572c4ffe3e5be2fac61559a0ac92ba.pdfIn PDF document text
    • http://chromoink.com/updates/file/bejefafozemiwisuranabejip.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9f5e65ac---mumajumevimewenezumetele.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/4096777778.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/69499473221.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/bekenumolal.pdfIn PDF document text
    • https://bczenekar.hu/files/file/98800233383.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/vukebujasewabuluzasiv.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210625031328158.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c70dd4eef9---jowamofiguzefebusepikabi.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606e537bea85a---nepuki.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/un8ad5sabdjdhstfr3jm9ie9c1/83918160728.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720c02af198---tumowifis.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a543209f9---53481094154.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/5b209bc9c685e58ce8fb73fceafacbb5/83143017337.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6cd62298435ed89b25e6dcd7b7dde710/61625282844.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/83973926580.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vigrfhcki2kkmk4fs2o24uq2r6/59333057577.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/43278846645.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6467m9s7u8ppqs7h9tmlf1fm0f/varusadujuwit.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ak3q2cnq4pr2d832g3064gpf90/61731763937.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0a28595df7bf02bb03900b95b7af4af3/84275437516.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083263ba595b---91891973842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=reciprocate+the+favorPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 16852 bytes
SHA-256: c9b8742b13dab8a2a251c4a32ea2665029173eeaddd3f0ce0164f216d64746e4
font_01_sfnt_off00011960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11960 10372 bytes
SHA-256: bfd481eec30b213ac3019a5305d3281453580617e9287c37f14e749c4bd1413a
font_02_sfnt_off00013100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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