Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a8b256ecd2fc24…

MALICIOUS

PDF

91.7 KB Created: 2021-07-24 21:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a66b55f7c17aa88c5dc59661adce8b88 SHA-1: b68b99aa6affd900db8a699c109b88f150637b2a SHA-256: 65a8b256ecd2fc2467934176e0ed6fb88bd994fbb7e477337f05e2146d803648
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/df37eaa09c7d01bb8d50e2fe73e87ad1/jabozamukexidebofewuloru.pdf In PDF document text
    • http://nordicaluminium.ru/userfiles/file/49998332337.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7294373e7---bilipigedaporakidinig.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bb9mgtjkpeotr811c49bplm2tl/pogobozolire.pdfIn PDF document text
    • https://full-flavors.com/img/Data/file/nizem.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/48867470935.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e164577511---94167268253.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a36a778f---popofuxezizame.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/pajatamisapusojasoje.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/2348218531.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/957479c58b45dafd21189d2937990b12/vowotilelotejudofizadu.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/ejprudv69g04qvol39hsnmoihg/ruxijoxajosi.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/96377746558.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/tipimejudipemuvonu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/digigegerosekupogobume.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/nodabufulef.pdfIn PDF document text
    • http://artospace.com/pics/file/fopivivo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/2eb192f73566476e557d21f79e021394/43344882714.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162db3bf14---17532029663.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/62609873f8a275a26acc5cf40eebc2ab/31693627790.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160866be753e41---92377687370.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/xasolomoburofagaxikalazel.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/ea56b42cc059a48cd0e0323101e5fcd9/boxoxi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d905f3b482---ditonigujogozivuv.pdfIn PDF document text
    • http://ruresept.ru/files/file/64402699646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=need+for+speed+most+wanted+cheat+codes+ppssppPDF 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_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 17696 bytes
SHA-256: de1f0abefad880cfaa5175d89f75c92ecaf56c9b470c94c433ada4555e30983d
font_02_sfnt_off0001474a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1474A 10808 bytes
SHA-256: bb092395674e19b13378531ab43b5665ad89cba186028c57a2695672cf755317