Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8836af72cbfc8c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 09:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 12ae3fc4956ef2cfa854892371a3d871 SHA-1: 61392cd76b5a25926d4767df9384f2bf77c5d5a7 SHA-256: 5b8836af72cbfc8c9394c1fca3477deff69938eabf5087aa5062daa6ce4ef781
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The presence of a PDF_RANDOM_URL_LINK heuristic and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a0ec38e5e---12092110804.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161102df611b68---69738597713.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210810172308.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/84990766466.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/74872499811.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1731580680611feb361afc2.pdfIn PDF document text
    • http://tid.vn/upload/files/52096314525.pdfIn PDF document text
    • http://land89.com/ckupload/files/bitejurabulameripodadoza.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/bosolikilomanap.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2d5e718f---tigodiz.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe3a2db7---jovajagokojazo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b28d7e1fe90ec94877cd10f9371c36a5/timosawu.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/27266086867.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/7e6a6950177c660128a5844784554712/dekepemifasabukoj.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tonawuxelepinojozudijafe.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160beb7e021f61---90030836697.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/df166836a3163137682a8e53e7e731f0/63305734658.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/4276257221.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096c4e948a67---fonotimeje.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/52322766805.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/000c2edb925837b14b6c50474fd677fa/zekolaxavasesiniwirotijo.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/dapakijufozinib.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/78209467726.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/55725793708.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/62295606289.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/31316798261.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/fitivawirabatawavubonoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=honeywell+thermostat+guide+pdfPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 18672 bytes
SHA-256: 56a39d05636ba7fef01f6880f9ff6391caaab7bcfea1e26240ee3ee539ecf098
font_02_sfnt_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 11236 bytes
SHA-256: beb54b2e89bef86a76c675da98e0ca463c44bdbfeef597e72967085aa771307a

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