Malicious PDF — malware analysis report

Static analysis result for SHA-256 b853c87f24b973cb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 08:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11960fb83a6027fa4686720b45b56fb7 SHA-1: 6fe871da20cdaa42952e3de8c1667d4fbeb03cac SHA-256: b853c87f24b973cbd3d76f995a585c7fd2068d450a53fea4936a8c879357107d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160703655bdddc---42082597235.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9c3707a51---51440667030.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/nofefedoxutu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/pi160bjj3opeq5c7n3310rlemg/bumotuletikosovesezikava.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/46d3d80949ddcd1226024d8bc5c4fb1f/kavizekonatixujurunotoju.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/53271496462.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/jifazekegasesonobulis.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/87739452433.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/86090026231.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f86d254fa---zewejine.pdfIn PDF document text
    • http://www.520amis.com/upload/files/18301778398.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/36874010127.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/622ed654c2b24f6cdee8ad82c9099780/80093015980.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/55552200317.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/54283765048.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/46760164894.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5ck711aa31qj9lstsq05d9etcd/tanurapipikeno.pdfIn PDF document text
    • http://shield-in.com/userfiles/files/94132795139.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/biselqpkqda6pf9fl0a0ubk4ra/fomikaworukozuxawevete.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/8934767167.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c88d15686---15084778276.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/48321628955.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129b3fa3c6fd---91632224973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=what+is+a+nonrenewable+resourcesPDF 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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 17888 bytes
SHA-256: 318dbb93d6046dbce45c9573a819be36d3c08952a3b07e0b54e44dfb2feb6aff
font_01_sfnt_off000100b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 10644 bytes
SHA-256: f1a1a7bebf88ac52a230780b46ed0062a302fdd12f25f759b07c645d3eb84212

Open this report in the interactive analyzer, or submit your own file for analysis.