Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c970381e961646…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 22:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2c772f623327931c24ac4d2bd9231f81 SHA-1: 43904a1b36d324e0bc6cf27e8650ff8635122a01 SHA-256: 96c970381e9616469c79e51834f96c0bc83478dfd9707e1b89b1fd1c71310cb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score indicate malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs strongly suggest it's designed to trick users into downloading further malicious content, likely related to the 'windows 10 crack download iso 64 bit' search term.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303f105084c---24052512817.pdf In PDF document text
    • http://sasolution.kr/userfiles/file/bifirijutexufarifof.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109080133036142.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/92390144242.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161385c61054b1---23209818694.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/96973523583.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/wivudewitowusibeto.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gigijunezonag.pdfIn PDF document text
    • http://imaginove.eu/data/Files/95197356853.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/39791657035.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/rexiparifupowuvilunozuvin.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161382ca5b30b4---wozuroxufinedu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133de8cf2d0f---41846431893.pdfIn PDF document text
    • http://skisun.it/userfiles/files/pufugigubawo.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/60807418312.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/09ade18f4280b133481647a19dc69553/rusasirijidanofipemakoj.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/vomatusuwotil.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/37068680373.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210910005223468.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/zifelivevibajojomu.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/fofosixonigekowukutefopi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jubeximijuxod.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/sexidulopisa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/wawepowubudawu.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/zatazegijepivele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=windows+10+crack+download+iso+64+bitPDF 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_off0000c35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35B 16724 bytes
SHA-256: 0fd3f2a3d3ef61da67c727dc8d8ea125c7327f6fe944c6be316e8cf201346d4f
font_01_sfnt_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A4 10964 bytes
SHA-256: db7e9f3e414b2a9b7d5e26b0df854425b5f4b554e74bd991a6aa1e638872e055