Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78698e1ec0d9549…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 09:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0361c839fb64f24793d580c782562b8c SHA-1: ba9e623ff265218c92ffb4dea2b374ac0b5aa30f SHA-256: e78698e1ec0d95499bda7944a0d6cc9e1422634169bddf100688146421f3731f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs pointing to various domains, including compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://laborke.ru/uplcv?utm_term=love+story+chords+easy PDF link annotation
    • http://eg-connect.com/uploads/editorfiles/file///57329502942.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/ledalerisa.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/kidik.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/burinupipuxekuxaje.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350fdb18f20---xixebexugisup.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/37a3521b9f685d052350687402011be1/64588527363.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/mitovavi.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/megerifubim.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/67630443993.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/kivuxav.pdfIn PDF document text
    • https://shibbirs.com/media/files/58778400989.pdfIn PDF document text
    • http://deltools.com/userfiles/file/bipipuwo.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/95952732448.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/jiwanimumedewobemez.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210901103506.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/72309272949.pdfIn PDF document text
    • http://sissonne.hu/editor_up/75410614086.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/sogebixiz.pdfIn PDF document text
    • https://rinducm1.com/contents/files/bedajegidalune.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/kixifozabep.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/78041040835.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/majisafalavomumejixomugi.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/38869227126.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/58633810139.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/zefikogupidaxupatibegesal.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/d3bfa863e3ffc6f1e824ff66c301a619/goradevofadewuzitizup.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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 18468 bytes
SHA-256: fa3c6ea9f50cd6b539ba01eed9b3fd25dd0dbd5dba9a152cfa1d3f307b96a09f
font_01_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 10364 bytes
SHA-256: 10909e2d8f801eb7ea34c0ff2779b65f9ff1f53f3844d6c1c68b8db92e8595fa
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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