Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced4a7151c2c5c07…

MALICIOUS

PDF

101.5 KB Created: 2021-06-30 02:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b422797275f5e42ff8bdeb7feb7e7b30 SHA-1: 4fbca8660a2c9929d2d0350c2376b388df47d9a4 SHA-256: ced4a7151c2c5c07a77b07d733212e255bfa5102082e1ecd6149ef50bbb3bbb6
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing links to compromised CMS uploads, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links to potentially malicious PDF files on compromised sites suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4c53f18ae---dufokowaxovumakepewusexo.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d579b03570---boziwufobejemupozujubi.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d95924689ea---46991567790.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c97189a5eff---346433563.pdf
    • http://bong-dem-long.org/upload/editor/files/gijajilijufazimekalixa.pdf
    • http://automsystem.com/UploadFile/file/20210504201221716.pdf
    • http://fly.no1-yes.com/userfiles/file/tujogakuwirunuvobivarizum.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e32f12e65---21324939057.pdf
    • https://zlatartopalovic.rs//files/durapuwaxob.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jr1iqkjqciharfdft6mch3203d/5243995075.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/9e963200559a97c1dcd6098fea94620f/30578423523.pdf
    • http://sportgalaktik.sk/userfiles/file/vivafobogekepol.pdf
    • http://huile-de-nigelle.info/userfiles/file/gibixusujewaradobadiruriz.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf6529635---73407761458.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dc7c6b86---25236857163.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862d009746---77177536893.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/7352dbb3d5f0b2f1f54bdac9b0c245fd/zotekupiwomuzenunijinevik.pdf
    • http://asianmosaicnyc.com/userfiles/file/85907640214.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/67adbe0b5ae4f18fdb2fcb4343c3d873/13555994205.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084928c92175---zabogififajiwasafapabal.pdf
    • http://asbu.net/uploads/FCK_files/file/belip.pdf
    • https://giverny-bkk.com/upload/files/30732471668.pdf
    • http://stonestudio.pl/files/upload/file/wifebuviruvibukomale.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+listen+to+pdf+on+iphone
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012975.bin
3d98efe83da69a83b8baae90097f875ce4caef41f408d04c9a5b2915ad024b45
pdf-font-stream PDF embedded font (sfnt) at offset 0x12975 10408 bytes
font_01_sfnt_off000140e9.bin
916f12109fed0b21fc9636de3ee3f4cb19ec1fe24e0767dc1c0160839c8d0208
pdf-font-stream PDF embedded font (sfnt) at offset 0x140E9 17892 bytes
font_02_sfnt_off00016eff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EFF 16792 bytes