Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda883288439de00…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 06:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e4c6a35ad446463a788678da641dd46 SHA-1: 30a617bfc0f8635578b6a13c9ef64e480642186e SHA-256: fda883288439de0095b8f1f4b0a74f874822ac4f6b82ffbdec4fa3278f86445b
176 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, indicating a phishing or SEO manipulation attempt. ClamAV detection and ML classification further support its malicious nature. The document body is heavily obfuscated and unreadable, but the presence of numerous external links suggests the primary intent is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/vefuxetezofarelojitup.pdf In PDF document text
    • http://beautifulmoda.com/userfiles/files/6013670001.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210901171723.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/viritelojetefire.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210907_144752.pdfIn PDF document text
    • https://atputasbaze.lv/images/userfiles/files/88639328166.pdfIn PDF document text
    • http://kechengchem.com/upload/files/lizasexisopixexuduxo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161326582c0d2b---3658411058.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/30076107060.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/98008957002.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/defujirapijitakawit.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/40419180822.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/xizifax.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/tirunarim.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/tixiwar.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/62094376625.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb89301d33---bijil.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/judosij.pdfIn PDF document text
    • http://vce34.ru/attachments/file/gobele.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/pdkri1nhnoscih3jvp6v4afhk2j8bt7p/42314764255.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/wakuxuridugorobuj.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/58048728537.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/dazobikuso.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/lijafato.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/xixaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+check+phone+usage+time+in+androidPDF 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_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 11184 bytes
SHA-256: f7a211d9e9e84a55b55f95ebed0971826ef2b9729d3a05e91a86dc826cada203
font_01_sfnt_off0000fdf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160A 18164 bytes
SHA-256: 1c152c6f2438ae41180f882a0774ab3f2be6a8e05d5096f9a2f07da57bab43ce

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