Malicious PDF — malware analysis report

Static analysis result for SHA-256 878b45f0f668e398…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 12:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2780e487c7f9f8f3f16b75dd53e0094a SHA-1: 78f08b21ee98e11f14482063d3820c4d589773df SHA-256: 878b45f0f668e398e23b2b977de4f30963475d2b8f4f86260862307d3749b12a
212 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple heuristics pointing to a link farm and a lure for a password-protected archive, suggesting the user is being tricked into downloading a payload. The embedded JavaScript and numerous external URLs, including those hosted on compromised CMS sites, further support a malicious intent to deliver a secondary stage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=how+to+reset+note+4+without+password PDF link annotation
    • http://gammatradings.com/userfiles/file/pidevimemegowaxix.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b84f3106---keninetumisejivuteseb.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/43372751452.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e888be8426bd0772fe1d79c6768309f9/jaxujej.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/2451767021.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/9261520215.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/8627688001.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/13010620565.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210911224549.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fjvrhm8e9vde7js8f8fp55p0n0/52929289831.pdfIn PDF document text
    • https://best-label.com/upload/files/79445246740.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/detemufusajoludixagojoka.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/2038069837.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/21157923556.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/lutad.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/vuvijesadelazofopobogovom.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/zixofaruvusatirem.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/94293745054.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210911120816.pdfIn PDF document text
    • http://altus.pl/userfiles/file/dixirari.pdfIn PDF document text
    • https://jagominum.com/contents/files/64517501464.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/73098320784.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_off0000d89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 10696 bytes
SHA-256: 3c7383df4472f57d6d24129d5576a83593802ebb2682de5d8a5708b3b5dcb738
font_01_sfnt_off0000f12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 18376 bytes
SHA-256: e5492e4831cad644ef67c1c9bdcf534fd04c9e2098f64e5dbebf0320b5564f4f

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