Malicious PDF — malware analysis report

Static analysis result for SHA-256 27228165fbc63885…

MALICIOUS

PDF

69.9 KB Created: 2021-07-19 04:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0ad6dccdeba34f74b2f244616297e4e0 SHA-1: b937fa884e5895e8a68197da103e0a267e780470 SHA-256: 27228165fbc6388599fb59de50f8f503812aa2c071664580da4a02d1e7fd88e4
176 Risk Score

Malware Insights

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

The PDF is identified as an image-only lure, typical of phishing campaigns, containing numerous links to external sites. Many of these links point to compromised WordPress upload directories, suggesting an attempt to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://yuhongzg.com/d/files/rutefenimolef.pdf In PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/23607537615.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e4c26bffb---fomiribigolivuxibijabe.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11ebce9673---zazumonure.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/35403604054.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/4hl7evsp6jd47qs4mtve9pkgv2/64524211163.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160910177e7c83---60768127003.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bca2199cb13---mutesigozojesenuxifawig.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/getibixigefetuzuxa.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/zisijabure.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2tsoo9v4pevdbc1pnamvu8hnoe/90163932337.pdfIn PDF document text
    • http://techbis.pl/files/file/zapolew.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///jejedabuxo.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hr83hjoma9krb7gvimm20km1cu/sakaganojul.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210627182031_uksotv.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/00a61c11163cbca0ef2b9d0da1b52da6/suxelejudasazodutilizu.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/98795531303.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d881723c45---43717585262.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/vafatepeg.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b39620672---jagudujevewemivon.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/jodisakisifawitununede.pdfIn PDF document text
    • https://digireg.es/upload/wutisona.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608845cc9adb5---xabazonujokira.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/a91b9a7859f59a4bb68e040b3f7142d5/kobideperoruxepaxeremutaj.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a220bec245---82922533632.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01dfdeaa3b---43965032125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=principle+and+law+of+absorption+fluorimetryPDF 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_off0000b603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB603 11220 bytes
SHA-256: f1c06703fd56322381fb61cdb94b801aaaf235cefbc600a8bf13f4e809d82b65
font_01_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE835 13660 bytes
SHA-256: 2bc4b3614553bf687d0cb975d1591b22d2415bf24f3f0e4be327e6f83857b53e