Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a729327b1f42a3c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 08:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2efaf46e602c468e6832b01b6f4bbb0d SHA-1: e3fd525cf3cb01676368eeb00088e6a3f53f3417 SHA-256: 1a729327b1f42a3c81f7553718afdaa11393cb59ed9b2a9c3ff4ef6e85f8b8f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://nomylo.ru/uplcv?utm_term=chinese+pharmacopoeia+2015+free+download+pdf PDF link annotation
    • https://thietbivesinhanhhuy.com/asset/files/surosogisikefap.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gd9si67tqc487rhocuv6dd4n7n/nemalar.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098769a6bb23---jaxawexute.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/bc3ac832b907d73094d1e5d42255f11b/30260586032.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611822086a182---10660619536.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/64371930547.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/85667870742.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d8274c76fbf3db13b9f7797efa2d8e55/42883493722.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac481679ef9---74566626036.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/96329706578.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/9318496882.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sotep.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fehgh4dohchbe2cb4oc4vt7qt/49105789019.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/nupewunidipijotasuto.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52b3ead8f9---80018643436.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729c7bc7f64---dujanid.pdfIn PDF document text
    • https://hse.tw/upload/file/revosulabuzowituvomubite.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49325520092.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/damagoponikiwerunuzu.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608251f02ed88---64056949882.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/gazilotoketakoxusumu.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/webusoruwa.pdfIn PDF document text
    • https://immobilgold.com/file/kisolimusarojogakebumeso.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a875f35a2---zobavajosirot.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xetolu.pdfIn PDF document text
    • 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_off0000def8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70A 18788 bytes
SHA-256: 7e7bd8863eb182aab4c529c5f2db5f26fd093d050cc7b58a6e5a6b6a2d57aa02
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 11332 bytes
SHA-256: bef2251c9cd7139726326c2145584de473deb9d74576f5306b76619ae757b094