Malicious PDF — malware analysis report

Static analysis result for SHA-256 6232e2db65ec84dc…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 02:53:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 929bf26faaef2b277231a3e2c178cac6 SHA-1: 8e6f968bd651a86c23ca227743e281accdd041a4 SHA-256: 6232e2db65ec84dc027ea60f183bd0ebf50567d4c3353a3f029c4b968a231dcc
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://abwingsde.com/uploads/files/91158863333.pdf In PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210826_D6D1FB4A0BA3AECE.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/5554074030.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/74691284981.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/33326240497.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/toximumuzolawuxikobaxubi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769a90e3419---21544132606.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/sumosokurali.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/jonit.pdfIn PDF document text
    • https://heyratacademy.ir/file/suvozojenu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/sogatavesixebigesego.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/4f7f3d593d85cc88d81a43efc9fa26dc/92703436810.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/wupugusemiwafum.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/a6f0d98ab08288de19794734c88dfda8/xafaziwupotem.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/52634679619.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/bedenugokabet.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6acb27c8---55791506759.pdfIn PDF document text
    • https://davaocarrental.com/images/file/fujuxatov.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/76270110123.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/bitaxomoxudunaxebulavere.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9c67020ae6ed6500da1f1d463d06f5e8/8352499691.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/davibove.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55ba68964---66871558887.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ximutotufogejumukoxofuvo.pdfIn PDF document text
    • http://innotack.com/userfiles/files/valozipotilem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=malazan+book+of+the+fallen+series+pdfPDF 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_off0000bce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE1 16808 bytes
SHA-256: 8911b0cb0222d457fd873a17e25aac00b48fbef02757c257cbb6fc478e09a8f0
font_01_sfnt_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 10880 bytes
SHA-256: 4aad0d6e03c410450a6baf78a99ad7fec5ba88e1c08c80738f9d97e9928dda50
font_02_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1