Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec59d7849caad76…

MALICIOUS

PDF

97.6 KB Created: 2021-08-29 15:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9094fbb3572dc8ed61ee158dc29da71a SHA-1: 7a6fe7bcc9a79b9f7fce043f0eb919bf83cb9819 SHA-256: 4ec59d7849caad76f75f7e433b5b21af374160921d4f4a7187f490e831305806
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a primary function of directing users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jungleflightchiangmai.com/Uploads/files/18308399282.pdf In PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/wotoxupurezek.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e42061b10---53800414245.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/napenusowatutem.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/64218030525.pdfIn PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/kizomemuxazopanojebuse.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dukunufufak.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940d688011d---38992893020.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/90917784539.pdfIn PDF document text
    • http://zl369.net/userfiles/file/sefirogikevutifuboleneto.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pbg9gbkf3avcb5ck5hnhlv19m5/45417842756.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161272b5ca8a87---vunafujuses.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8f38020d---15724100697.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98fabb3c44---93072180770.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc1f36424---20353575111.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/finivusefogonudowesenik.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/bezirigatadimubewutomuse.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/18774563588.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/48653413664.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c850ce8881a---bixokokopivegufezav.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f4bc7f689---zulosepetewo.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/53015041570.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+meaning+of+directly+proportional+in+physicsPDF 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_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 19612 bytes
SHA-256: 72eb310caf71374bf5718f4a23d5fd1ae6c3c46b23016455aa6ecaeb047111fc
font_01_sfnt_off000145e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E8 11176 bytes
SHA-256: 8fbde305b3993cf24ec83bea444b86ddf802037dc2c5dd2c50abc30a868f69d7
font_02_sfnt_off00015fae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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