Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc834549537af533…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 09:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 999a00e658d68108e367cdccc562ef5f SHA-1: 835027a33279cab9b2bd5b00f9567166b22422f3 SHA-256: fc834549537af5336706b14eb81a13758be0e3bd941a98c224db1872d1d69dd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. No scripts were extracted, but the PDF structure itself is used to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://enjoy.sk/editor_uploads/system/files/35039657679.pdf In PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/44654781192.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/8439561125.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/tilumifabetowolegufabe.pdfIn PDF document text
    • http://hkacca.com/userfiles/nejitonomabuxeponako.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/dokiba.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/73193160865.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/nonadowojilonuvaxu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/10324275585.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mi8bpc1rdpbseivkpq3rhcmn29/45020698060.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/73374956278.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/88484789107.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/95565334909.pdfIn PDF document text
    • https://gotamsui.com/ck_imgs/files/soxofifadituxulet.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01e42f50d---79542351105.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/15125463354.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fotomurinamagos.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/lobofetexozomugikazokaz.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16081c65e3a39a---99937874128.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baeff71f739---danalapasij.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612378e2d2e6c---sosotifolo.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/261ile390a3ssq201duhfkl729/gotoxisemobovugulo.pdfIn PDF document text
    • http://cochu.net/resimler/files/26219505247.pdfIn PDF document text
    • https://masukpt2.com/contents/files/ruvujorewalepaki.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1ecddfd17263384f25e212e0c1b7970d/jixudobunugibosemafunoz.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/0ba07e64934847e7a8e5ecfc7ffe262a/jufuputor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=formation+of+mgcl2PDF 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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 16968 bytes
SHA-256: dc0892e504dc3d6174a855acfd6ba6d2c17a6034d32303458745b32b5298d142
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 10476 bytes
SHA-256: 0a6849829c28f959ae1eb2cf8cd2b9a32327df81e35e5be14ed6debf4c295b10
font_02_sfnt_off0001199a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.