Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a48fe2f3c0184d…

MALICIOUS

PDF

87.9 KB Created: 2021-09-21 03:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7e3dacaec3ee83b123ab4d07fb86ca5 SHA-1: 017b425d688f38a75a65ca9d0523101dba8b99a0 SHA-256: c4a48fe2f3c0184d6f4d7f4a131f5f9f89a0129b43fd382e695d5450e9b949c2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are highly indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 https://nomylo.ru/uplcv?utm_term=dj+apps+android+free PDF link annotation
    • https://rsun.pro/admin/ckfinder/userfiles/files/48813170753.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/17387827040.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pemafodi.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/rifopujemamokipojaxogur.pdfIn PDF document text
    • https://coevent.ru/upload/files/9097898049.pdfIn PDF document text
    • http://koddous.com/userfiles/file/gevanawiwogisogexinotik.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab4c0b8b7---14373422482.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/nogapumisiduvuvukugone.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/54136828790.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/gituguwuxiruwo.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gegilolibilojom.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/gevikoponajiwasozizow.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/21958194238.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ad671b5ec74f4dddfd4dba487fe867b4/wezoridepuxuxiwajalazikak.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/tivupatasubazizalej.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/jisawibisagedibami.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/jabipibo.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/lomoxuwepudemofitetidomu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/41a1937e682a452830a66dfbcfb9b528/bibemufeposoruzadap.pdfIn PDF document text
    • https://ubranni.com/uploader/files/96684016283.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/76416918080.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/xonogubijotowase.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/22618612244.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/ziduzufewod.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/bewixamutibudikanik.pdfIn PDF document text
    • 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_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 17624 bytes
SHA-256: e534eea2657b980b09a6992c213c5982a767e696195990a379ea2b1f0e4ed4a0
font_02_sfnt_off00013a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 10480 bytes
SHA-256: c389eed0ece1c56f06fc32e41347b931fb1e749ce0613076da0f8452d7307f2e