Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd35d643c3c3e91b…

MALICIOUS

PDF

78.8 KB Created: 2021-09-15 14:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec63e4d7001864ae1c13efa0f68bd261 SHA-1: e73007bbf34b50ae9c47b5c3f17170df9e07691b SHA-256: fd35d643c3c3e91bff64467a22a7a61ebe99dfb51092303b7c5723ca4abfe931
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

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://ansonseatery.com/uploads/files/jamasotufinelapadatadi.pdf In PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/kebasowuzedopekalod.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xenoden.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/69875081179.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/95683485200.pdfIn PDF document text
    • http://floralojistik.com/userfiles/file/96231139965.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/vodosufewavafogo.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/soragepamizam.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/53551619260.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/00db902869f561941aba917154eb8a3f/xamozokebuseramupunupuno.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/libakep.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a022ce419c---mesukebakezodidisos.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380442921aa---lotimudezaludorivefuviwi.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/tofexeti.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/lexuzolob.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/jagoj.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3e686a8d---23890000257.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/24492267355.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/kapesizoketoxelupu.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/jefamizijawi.pdfIn PDF document text
    • http://yongqingtech.com/d/files/furimezamapenedija.pdfIn PDF document text
    • http://atya.eu/files/file/logano.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/13/17534440005.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/14284f2f159d052c39bf7531c2c772bf/vifim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+factory+reset+buttonsPDF 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_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 10756 bytes
SHA-256: c226f094af26c1c527b7d4f7b3796e46f53bb91c80a6a6fc6e8b7321dfb12af1
font_01_sfnt_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 18724 bytes
SHA-256: 5a19893e72d7ff258b288c032d3b76d33d5b736e2cf1b3f7174ff309e9145674
font_02_sfnt_off000115d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1