Malicious PDF — malware analysis report

Static analysis result for SHA-256 1019631c0b99c245…

MALICIOUS

PDF

90.9 KB Created: 2021-09-21 00:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5843e59e3227584ee643935faac88c8 SHA-1: 60126d298a4c4404af55d426671cbc5adeedc5a0 SHA-256: 1019631c0b99c2457d431f81296ccb9782a8708db000820cb7a8a24e881e06f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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 http://annassteen.com/ckfinder/userfiles/files/38376123462.pdf In PDF document text
    • http://visoda.lt/ckfinder/userfiles/files/30721490917.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/21619856338.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/7205995422.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148c0a03e78d---xewumijakefifabisajon.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/67734812407.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/53852000247.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/mewexelosevevoruwagaxije.pdfIn PDF document text
    • http://kbchina.de/upload/wesokomakitozavuzep.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210918file///nidenikekemalatunuxi.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9db2ce81---wejutuvizi.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/64785498268.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/77592991462.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/69985549733.pdfIn PDF document text
    • https://harteron.ee/userfiles/file/93347769848.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/650dd75231161d32b70eb2c74e8e1c44/87772890900.pdfIn PDF document text
    • https://ultralloy.net/upload/files/82881589652.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/46c3ee362de6bea1b361f687f73fb724/dusebexosimurefetidiba.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/74426028333.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/wadelebilevema.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/2785837208.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/niwububorososevunobodorof.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210901/files/20210901105937.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/24215995893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=dead+target+mod+apk+latest+versionPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1C 10896 bytes
SHA-256: 06544e7922ded1e7e790d376c69268061584451673656ce731c7861737ceb4d8
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB26 2360 bytes
SHA-256: 04c002ea16b2a928cec6d608785873fc6149ed41402e9e7a5c5a2d70c03c5672
font_03_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 17100 bytes
SHA-256: 0332297850453b46d4019ffb52a6f48ace502df38503ac45a83c051f5c87a8c9
font_04_sfnt_off00011e90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E90 25020 bytes
SHA-256: a374c2647b9c8161a723631765c3dbd3f4b64dfad3d6096fb88fd4dbfa204d20