Malicious PDF — malware analysis report

Static analysis result for SHA-256 11940551f3ed7097…

MALICIOUS

PDF

83.2 KB Created: 2021-09-12 12:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ae7eb4189e80cd5e7b31fc3c7c877be SHA-1: 6d64ad527c354b44ca5e64d5c5d13ae076c9e42a SHA-256: 11940551f3ed70972beb895508f49dd3f9720e873bd589270e9206d373c22c3c
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://hcwan.com/userfiles/file/28278146196.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377ad994806---7871289218.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/9307606174.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/zajivinaba.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/56017538428.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/23751374505.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/vafipisapamom.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/627a3c2754095039c14142c87d0de2f5/72107500766.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/41382571160.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613195ce5038e---2799017948.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/19150658283.pdfIn PDF document text
    • https://digireg.cz/upload/11550276071.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/zaruredazunugape.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/19420289235.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/65730384513.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/rulozobifuj.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/49771868291.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/37908413418.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/82070089519.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/52278765573.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/77674836202.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/voxafebememexelamipugum.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/wawemuj.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/jigosetumivugog.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/zategem.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/5acfb918667aa6a0904d3923dd26178a/78093795532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pokemon+super+fire+red+apkPDF 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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 19536 bytes
SHA-256: f96a08736dbda2e64dddbc49b1d760cf187116bb5fd58d0003083dddab0ee3fc
font_01_sfnt_off00010e35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E35 10708 bytes
SHA-256: f2ba6e3782d93d2a0411f478a9b19745a4d6dd98bccd3037cf5ba980cdc0983e
font_02_sfnt_off000126c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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