Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb655b42a94d1b1e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 04:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8b699dfa10a4abc2e81a70a5453e3f6e SHA-1: fefcffd30a823a301e796b5797b54219cf5964bd SHA-256: fb655b42a94d1b1e2a9211ce8e690a54e8bdb5ac2aa72dbe39eda9a85c7ae617
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised or disposable hosting. The presence of external URIs and link farm indicators suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hanaelectric.com/userData/board/file/44242964709.pdf In PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/74249429603.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/mirobamudoxunule.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/gumorijifixugusudekezew.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/bugud.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/fomotawasodivesofesiwugaw.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/21270297618.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161304f5f0f74d---34522971366.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/17719554744.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/titoxowibezuti.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/nunaber.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f960abb06---48434563796.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/55571322543.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/fivanob.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/37490601754.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/voxenuwizulutexinib.pdfIn PDF document text
    • http://simoncaulkin.com/images/88689041046.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/womuzetewabonawatox.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210915213420.pdfIn PDF document text
    • https://timavoshipsupply.it/userfiles/file/46885512002.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/fadanilonivalis.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926317bd1d---97454654564.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/050dc9ced68da534e03ca4e054efd9de/53685421249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+online+xbox+one+god+modePDF 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_off0000c243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC243 17880 bytes
SHA-256: 53826cc97481a09a2788a1d9b784eb70696898342fa54cd8633995e9f3e5debe
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10740 bytes
SHA-256: 9c87dcc4283ee6ba1ddbac43f2c84dcabfd07bc5026e8b5fba574b0b3d6cff0b
font_02_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1