Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f43ec47822e89e7…

MALICIOUS

PDF

74.2 KB Created: 2021-09-05 07:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b43471f993409cfead657063f7fe795 SHA-1: caa6ac5d5be55d384ffd4b962bb6ba9cee03591b SHA-256: 0f43ec47822e89e7025b1d56212495abe7decb40b36c363fdbdba1892c676fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to websites hosted on compromised CMS platforms, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://giasuthanhdat.vn/Images_upload/files/47725851298.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/d4c90dbe6b6638caf47c9ea4f2290a3d/67898591438.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/vilodonuf.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/emhkfmtg4q2r6jdldcolf8kal3/83394801768.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/60924405861.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0598ac1df2---12663162511.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210726103550_zzhgag.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5tt45m2hgoq3hdhkosipodnjs6/nafip.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178916ddc4---sinasigotuvogep.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/57965207425.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/rozagafenileditetotefinum.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/814c309e382751b1608c513a279dffa4/33177451229.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f85d20e3ede---kuvefi.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/muxijo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/g4fhiiva62plonh14fma69hogi/kewobazenulujexam.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/3144587290.pdfIn PDF document text
    • http://beta-rc.com/upload/files/fijaxabifepewiwiwebipepu.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/d43cfa533ba6af46d026f6a533dbbd95/digupozak.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/estmigdtkql57keksekjvrrlps/28609380900.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/95669119707.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/9662006549.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/77480119328.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/75027a2bad888e233e55c7631a710327/piziveramapiv.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-7/20210507092439489431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=talk+to+me+in+korean+level+1-9+pdfPDF 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_off0000bfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC6 16336 bytes
SHA-256: a9ec77a469290ef70ba6821f9387531b7807dbe9aaf860c140ea65296903a507
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 10868 bytes
SHA-256: 65cbbdcb178a30b70429c134e172bfd36edc2bc401f018bb8c3ddc92c54197f5