Malicious PDF — malware analysis report

Static analysis result for SHA-256 270a2c64653abbca…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 08:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d8604617a56a22879002d1df76ec9ef SHA-1: c5280759e2211a73772f61212d3ff98f60c6c073 SHA-256: 270a2c64653abbca4a017bc0ae17e09eb233b6d06c7c02675a195b0ce3a8c8a4
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted hosting, suggesting an attempt to redirect users or manipulate search results. The presence of multiple external URIs and the overall structure point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://venus-forever.com/image/files/wimim.pdf In PDF document text
    • http://levotst.com/uploads/files/fenobarujuxer.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/savevefoduniron.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613165a13f5bf---82233446403.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/sikudiguju.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae2eb849e---81900250428.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/xezuvonitisusorit.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/91777191071.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/rurerofenomasobavifivav.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/finobite.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/80145711093.pdfIn PDF document text
    • http://eternaseguros.net/files/files/devukuzafibevovije.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/47762211544.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109121348243045.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/46334909237.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/59932733320.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/32204522221.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/wigenodoru.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/35984057257.pdfIn PDF document text
    • https://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/bekezufisenudokiwuwu.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/16470247983.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/36375071123.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9ed8a45b9617a1c95602a3beb40bd9ab/puwuvejukifurinalapam.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/gedezomigogivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=jigsaw+full+movie+eng+subPDF 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_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 19388 bytes
SHA-256: 01a484a5337cb6e031a92ae776969db6f7878c489f4e847894bd9bce15aee15f
font_01_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A1 10740 bytes
SHA-256: 9e4e6c007fdcf584d56a15b44200ce5051f0df321b2186488d3ac94c239f0017