Malicious PDF — malware analysis report

Static analysis result for SHA-256 c671f496d89a126a…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 23:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 837ead6b145565cf0f9d4ecf76f62c80 SHA-1: e2e0c275165908e00314b5b6eccf066f16e01b4e SHA-256: c671f496d89a126ab78612dbcb826d80b7b9aa8779f019c9d7ed21ade053747a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with exploitation techniques that could lead to client-side execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://garglob.ru/uplcv?utm_term=download+opera+mini+7+for+android+apk PDF link annotation
    • http://sanfrancescovet.com/userfiles/files/tatefulokumufupo.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/nopubepavenafufexenade.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614486d5d63bb---96937417892.pdfIn PDF document text
    • http://kaies.net/upfiles/file/rebekanipedamefopowipal.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/virarudewoxoneka.pdfIn PDF document text
    • http://scpt.it/userfiles/files/pigowapimajegejul.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/gadix.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/porirupalunaliripufopima.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/68295851870.pdfIn PDF document text
    • http://belniig.by/public/file/kikomuzevifulewi.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/bumaralufoku.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/28610964933.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/72f8e8146f6378555497dfb6ad0093a6/76251194695.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/tepimozigomam.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/64189426821.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/8706525909.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eebce0eefe---95582849297.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423afb36aad---48212874851.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/54290336780.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/56298334179.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/17855538685.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_off0000d190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD190 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A2 18608 bytes
SHA-256: 349ae06cebab14e420255f4fc8804740969b81344cc8121008c752758d2beaac
font_02_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 10620 bytes
SHA-256: c755b1ea48c06d0992c6489bb87588e7f43f3365e37db0501aab91549b015abf

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