Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc7cc247d7932d8…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 05:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ecc271cf96b58f53ed3602358cbc27a7 SHA-1: 367d1806067bc5ddf18656bebaa28bb0a1268a6f SHA-256: 5cc7cc247d7932d89650e94e404ab057a0aca95fad02eddc5e122aeb44283006
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and a link farm heuristic points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://broadcasthub.com/ci/userfiles/files/15024101676.pdf In PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/gejujonigiwizod.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/30022892808.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613857f636f01---10235754047.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/gedemuvapakoxerupinemezif.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/50992467180.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/dikafukewuj.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/83900176288.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/61917480030.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/bodofebodedonaz.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/kagenetovuju.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/situsazubawawewu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/60646323977.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf0a5ab0b---1512864448.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/74731201348.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/27288332267.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/87871563126.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/69702069019.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3005370ed---bodagazikeluv.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cddd7f7ed50a63c37c40ad11e41e7208/50141947098.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/99612903318.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/tuxibikupikuguwip.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/4922701488.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/febopob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=loteria+app+androidPDF 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_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 10128 bytes
SHA-256: bf2049090bf27523d3c1251f0c3119331ead141e5e980f33c7e96ddea78dffb5
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 18288 bytes
SHA-256: c92de5e49aaaa3ca119d1d06d2e31c1e88bfe467e91180420dcc5e7043281868
font_02_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1