Malicious PDF — malware analysis report

Static analysis result for SHA-256 b815627354ebf29f…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 21:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d744ca5055df7e648539494d45770b7d SHA-1: 6978790dc0aba7eb53e13def96d0d06896693385 SHA-256: b815627354ebf29f7b30c4055ae4e9bb4f8f82ec3ba799fa0ea7211f52d2e2f6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to potentially malicious sites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=updated+among+us+apk
    • https://pieseautocomenzi.ro/userfiles/file/fapemevufezazebomam.pdf
    • http://webminmax.com/userfiles/file/liwasobotedeluse.pdf
    • http://lohoithaiduong.com/uploads/files/91329969016.pdf
    • http://allefrgycg.news-read.com/upload/files/xopotunotudovajogo.pdf
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zumefasivalawubugaj.pdf
    • http://pokebarslo.com/uploads/files/7419077786.pdf
    • http://scandirent-new.ru/uploads/assets/file/55372902587.pdf
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/vifizopakejal.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec999478e2---vuzivukemusoseduji.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/sonibilagituronoweraw.pdf
    • https://ladangmimpi.com/contents/files/zikexobilukaximazo.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407a63bf62c---7795143132.pdf
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/26029747773.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8354cb3d---welidowugatozorunokami.pdf
    • http://abovomedia.hu/_user/file/siwujiwoduge.pdf
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/65101315433.pdf
    • https://indikino.com/ckfinder/userfiles/files/vimoduzenumi.pdf
    • http://hitelesen.com/userfiles/file/21891861376.pdf
    • https://vibingvibes.com/userfiles/files/90738946317.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c80237e3f---38166527456.pdf
    • http://ieltsadd.ir/cache/fck_files/file/bupaxoniruxedokeniva.pdf
    • http://ls12368.com/userfiles/file/fujobagufeka.pdf
    • http://tensoinox.com/userfiles/files/kugaworofib.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613004111869a---kuwosifixitokane.pdf
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/12454057931.pdf
    • 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_off0000d21b.bin
e872677383ce3358842c4373c10744edbc44a9f2e8d240f9da0f889bcbb11e30
pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 17740 bytes
font_01_sfnt_off0001004b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16792 bytes
font_02_sfnt_off00011862.bin
30fe1ea11591174ef83b143cc761c20feebe785b83f347004d84a8f943ff9a90
pdf-font-stream PDF embedded font (sfnt) at offset 0x11862 10696 bytes