Malicious PDF — malware analysis report

Static analysis result for SHA-256 585e8c08634274a8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 22:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 994da15a7d37eb6e7cc9b45b955bcfc0 SHA-1: 90343f71f81bff4753d9f18ff603581a31e4f6e1 SHA-256: 585e8c08634274a81cacd8e96321af8ad2e8bf7ca32bcac2498934ec58c3fbbf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external links, some pointing to compromised or disposable hosting, suggests the document is designed to facilitate the download of further malicious content or redirect users to phishing sites. The 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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 http://mentaplywood.com/images_upload/files/19042458003.pdf In PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/sosufigufolafejuguvujo.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/xajuv.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/letesurafufuzel.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/vimivolasanurutiba.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/famuxozonowugumutake.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a13f2f82---pidefumipuva.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/xaxenomezerulesisiditil.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/wafebezitibere.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/9879390713.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109030756343603.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/rovuvafikeloluz.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/75560310567.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/dupapipofisanevifirevaves.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/pelatinalafurej.pdfIn PDF document text
    • http://coytex.net/ckfinder/userfiles/files/2711044916.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/litizutel.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/guwefovululel.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/50551934369.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613805d34debc---55732269927.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210901122928.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/05b66e77d8a765417f130009f98c0ebb/92543243386.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/48676186981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+tubidy+mp3PDF 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_off0000da70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA70 18208 bytes
SHA-256: 57cf10d1768bf75d2457bc8a8b80ebc27d6482e465256bb3871366e1937d5508
font_01_sfnt_off000109f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 10320 bytes
SHA-256: c913c0cb41ed3ad60ac7e7ed22fac3bc68bff46982843ade15ca45a40464078f
font_02_sfnt_off0001210b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1210B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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