Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfea24e6c991600f…

MALICIOUS

PDF

135.6 KB Created: 2021-06-29 07:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8304f4d017ae36ab53d1e5bcf0e7d480 SHA-1: 87351855b0da69837b6ec3c304cecdf79a6da32d SHA-256: cfea24e6c991600fbc0a80683fedefffed18a0fa5f464cab035b9cf9b5070d0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous URLs indicates a focus on directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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 http://ferrocom-spb.ru/userfiles/files/vafizupujadusef.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f8fc70bca2cb8da54a678c0be3db1770/gapefesemesuz.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/fufiwowumifeboj.pdfIn PDF document text
    • https://nadamasristorante.it/file/bifenirivikor.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/jezamenobudelokolezugemuf.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/gowoninekibalefagapexi.pdfIn PDF document text
    • http://stylekd.ru/files/pitubenoxaruzinenoxodo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/32153627040.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6dce8c95310fd244001fe83ac4d1f45d/runorolizek.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015501d7fa---21501194309.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/debajokibib.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5641fb8adeea47606a09ef65820cea07/jipuvemilorewugik.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/barofinepolimexulitaset.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f627a100cc---fevadawuwegofutovofijojo.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/79076891326.pdfIn PDF document text
    • https://birudongker.com/contents//files/xugetisupejidejan.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dnttl47b9nofk1kp774lb40sa6/derakum.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9d2aa5099---lazurawolafuramudejenuti.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/facee1b2921b88f0d0f75f8e829d353a/daveguzanididukidoxagemol.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2573b3cfd---12023940921.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210606032527.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/ramejosanidonalupapo.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/gfgjfejjghigimdsqisr1qigos/setaj.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e9f77a70c696547d5f2f4cf8eed339c0/zexuwatikunuweginajujew.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/didaroxizadu.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb3b6aeb1---56393545119.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185d80254c---5343992717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ashes+on+foreheadPDF 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_off0001ace1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ACE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c4f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4F3 21136 bytes
SHA-256: 02efa010c71da9cdbbba2a18b68e6c01463f4059a4dd5961bfc3d5d8a945240d
font_02_sfnt_off0001f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9BC 10196 bytes
SHA-256: 903d961cde3412776c2070fe05347f0488fe814702c202582d852bfcc43e0ee5