Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d848248e57ede5e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 08:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 067d2f7c94fa91642c5ea83ccf0fc0cf SHA-1: 93e51b839260daff16217fe8c9b11ff46871bb50 SHA-256: 6d848248e57ede5e54e12d25bea2264938565040e9eaed5f20a912d81e21eb36
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The presence of a 'download button' heuristic further supports the intent to trick users into downloading a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=tenet+123movies+hd PDF link annotation
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/dfdf68f79c13ff7f34922b902a47cdb1/kelatixedu.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/fejozukafelewimawivi.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/5650238794.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/41389809909.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3770e23995e1cac014d11a425faa957/limixenoborore.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/donuguxiwozupamo.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vesemisutolajosapuz.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/wokajajod.pdfIn PDF document text
    • https://expomediainc.com/upload/file/miketisax.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/45933347979.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/49439547718.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/tikuwimitezidule.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kuzeravimaziwo.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/12398148356.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2e7b5607da0c4fe04a60c442160dadc3/tojubukakisimodomije.pdfIn PDF document text
    • http://bdsductri.com/upload/files/penelowulunuwolezewoxub.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/91594881462.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/menig.pdfIn PDF document text
    • http://gaudi.tw/upload/files/pabifurikipebexaguzoge.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nelijesulekotabobizuvere.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/ruletawit.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/94332641050.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/wowujodiz.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_off0000d94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 18548 bytes
SHA-256: b5cd260aaaa4caeee6d7581894ff137a5cfbd94ece71f30986bdee3f5adcec1f
font_01_sfnt_off00010a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A16 10580 bytes
SHA-256: 0e23271d4da1c8f035175dd3246d797b187083ddcf0100547ec2e1862b02b4a1
font_02_sfnt_off00012237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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