Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10cf1e1f1fd9950…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 23:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e8d77145e139c06fb5686b99b60ac026 SHA-1: a33df6db90d478a82bfb3538185eb21def1fe641 SHA-256: d10cf1e1f1fd995023be7a416fec9a23721428a19bc987d1008c259de386b967
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's used as a lure for phishing or to distribute further malware. The presence of embedded JavaScript indicates potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://worldsocialistpartyindia.org/ckfinder/userfiles/files/sipuga.pdf In PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/49357100993.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/bonanewagiruvawovolitew.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/5879469772.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/76264668631.pdfIn PDF document text
    • http://naviway.su/upload/files/liloxelebidibesub.pdfIn PDF document text
    • http://tcihk.com/userfiles/38276377722.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a7381ffdc270e198dd9c041a91fc9d5d/85746188590.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccb0870b5---xevaguwukepijaruzak.pdfIn PDF document text
    • http://naso10.com/userData/board/file/93945589585.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/lebiwen.pdfIn PDF document text
    • http://rococosofa.com/files/files/25023796045.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/12589189330.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357d88b70d6---45666685627.pdfIn PDF document text
    • http://sdes.in/uploads/miwomafajunipuvikunopekur.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/92393518549.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/56969669569.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/7245059779.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/59054882677.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/siduvakexudizepojare.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/30827960979.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukubifivufatifud.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/filoxuvegofizebagiwuwud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=using+face+recognition+in+androidPDF 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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 10612 bytes
SHA-256: f323a1997502356873adc3168db53338223a2cd8ee83d8b2cafc072f24a513ea
font_01_sfnt_off0000f558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6A 18072 bytes
SHA-256: b2fc2ba12af00206445b900e6475670ac7e6939b163451e4f6eb1283ef0a4c81

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