Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f78553f24fee2e…

MALICIOUS

PDF

74.6 KB Created: 2021-09-06 00:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cb4149c428f202edae0d5567ab21e0d1 SHA-1: e45c0fe6c09a1640db96b3c8774b41aec91cecf6 SHA-256: a5f78553f24fee2e6d7e0d0ad920d5f15516aa1a79d58b583512c75104a32282
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 WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073822b2fb3a---56655559723.pdf In PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/22324580068.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070312f005d4---69211372621.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/vuxupexiginub.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/nosenogefazafapidobix.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ja2gopvm6naf8af6v32007s314/sizujexe.pdfIn PDF document text
    • https://jmclimatizacionhvac.cl/images/subidas/file/vimetiso.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/22936744728.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/genajomobuwodu.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xeseruluwipozon.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b302345d537---60075690254.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/69938c0808cbda1d5a337ab7289db94c/71025286255.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/k602ms9c3iskrrnqrmgdjumv74/batem.pdfIn PDF document text
    • https://mfdesign.hu/files/file/zedozizife.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/4558229505.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/90692809366.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/9b1c90ae95f9fc90f5170df543f436a6/34956927376.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/58996376994.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/rasupexasufakesodudenuxom.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c73ead026---78787867637.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210826154509.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad5dd9a3a---bimenosuvagurexubevurizis.pdfIn PDF document text
    • http://zzquansu.cn/d/files/leganibip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=practically+speaking+2nd+edition+pdf+redditPDF 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_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 11124 bytes
SHA-256: b06b6ae03a7dc4a9fd4d663e42bedec60138b7192ca2081f1e6c77bf420828bb
font_01_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 17020 bytes
SHA-256: 7c2e7b195d317721a7bd610050db8384afc37d07da05136747bdd356ab13c342
font_02_sfnt_off000104cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1