Malicious PDF — malware analysis report

Static analysis result for SHA-256 efec04589edc6b74…

MALICIOUS

PDF

144.4 KB Created: 2021-07-03 03:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 11df7f71163e81a4cfa03c534514612a SHA-1: 77c7c51d4b5df8c5014aa6d6b72be950deef7a83 SHA-256: efec04589edc6b748aae45e91e8915028ccbbaac5706cabe541345bba08ae98d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c1ba2430---miweriwawipunarir.pdf In PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/60281293608.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/f4f3d4f4d619913e63f89b86e45d8eb8/13175599329.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b650b2464a7---71135155673.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/61999b3207629a6d0b1c232a72c7d231/52240483771.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/96817906575.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/xekigutaxopowepefi.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/73396381820.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210626_181150.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608eba2c16ad0---72241083836.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8e4ae230---99442950450.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/sitelejenaxebode.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbfe21a388---60189816349.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/96056917354.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bf29b6b36151ae2a3f6dc2617fa4c407/27132304126.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8105a92d9ad6920b394e1c75303f3c0c/99619795157.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/duwitazezev.pdfIn PDF document text
    • http://sheeld.org/clients/d/d0/d021426cee8527c21a172be12ef3d645/File/fiwutaned.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/31ade8006653436b813ec2d523e96821/84030351763.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923d36bf0d---fakuxuxazinesazojawupolol.pdfIn PDF document text
    • https://marosme.ro/hirek/file/diparero.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/js2luo3s2akup9dvloh8r3rt48/82345663873.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/xomabuwimemizom.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/piwuxurusenur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=letters+to+a+german+princessPDF 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_off0001d2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001eaff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAFF 19220 bytes
SHA-256: ad2827c1847167e642be6e14ca3df2a20ff211580e19e4298651bf518349dd7a
font_02_sfnt_off00021b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B79 10628 bytes
SHA-256: 73244ed30b6d3e7b5faf4bfbd35c02a7b252d42eb547456f6044b03700d23137

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