Malicious PDF — malware analysis report

Static analysis result for SHA-256 25cffed51483714c…

MALICIOUS

PDF

132.0 KB Created: 2021-07-22 02:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 991a72ef157ca6b17572425f8646cfa9 SHA-1: 6814c152c5dd92b3c8c8bae2291d7d765e86458b SHA-256: 25cffed51483714ca4504c56573e26f6b1dd94d2968e4e4e511c6085f2aa1148
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate that the PDF links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/0468145ee6c8f8617ae03d40bd1adc52/musem.pdf In PDF document text
    • https://hohsingfiber.com/ufiles/files/xugoxuvibavosal.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160acad5364006---kujutilu.pdfIn PDF document text
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/gikakef.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wavidabotutaxipitip.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949c751de74---nugoderitejef.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2a9625be---pujapixaduked.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33d0902cb---51179845193.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/pufilevisabom.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/geradokokegupuneze.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/78941702862.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/wisiwelorijipetago.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16087d087e6700---polakoxoxesuxexeboja.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fcae65b1---15720757262.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160745e300b9aa---27767975036.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/mickfmla66r2rl0j4amcicaej1/86780226013.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/fovogiwutawavevubufotebul.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7da3816072f7ffc512b82e9bf2588214/nexesazibotimutamebabiw.pdfIn PDF document text
    • http://127.0.0.1/bantraicay/js/ckfinder/userfiles/files/61118081936.pdfPDF link annotation
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/f2c4504acb68990bc02b10863cfa22fa/doxubapadi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/volonapetesiwujete.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0a3a2f94a336a492c713105b525528a6/jofinudolorogow.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/lirojenavumagegefakur.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/56269648601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=words+starting+with+t+and+ending+in+tPDF 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_off0001a2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001bac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAC3 10560 bytes
SHA-256: fe91461827b1871cd91d2576c17166dd90f4a6b938a0dc40a6fc15799416c25d
font_02_sfnt_off0001d29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D29C 18032 bytes
SHA-256: 62921f16b61009ad45b63aa69da1a6ef6dbea2871a1da7320fc4d4c86411a8e1

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