Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd1581c110dec81…

MALICIOUS

PDF

75.9 KB Created: 2021-09-24 15:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7982fb4172a3cc3371399a77fd3e89ef SHA-1: 2dd7c22e8358d98d353d9c12196d65877f2ba6df SHA-256: fbd1581c110dec8111399177e92c715bb09b3385ed18dd0b4c691cd430f9d8c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs that form a link farm, likely directing users to compromised websites or phishing pages. The presence of external URI links and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=sistema+urinario+pdf PDF link annotation
    • http://htwy.com/upload/file/166408962.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1c1757764a2a4d06111812439f601fb6/53296225041.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7812805614.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a9e48f0---dopanalojepuvodena.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210921014719.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/20810003230.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210908_54202A8A568B2AD5.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/xowuvumujumaxibipul.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/94068686147.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/34284737152.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/50272364947.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/51026492546.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/86887806049.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/14474646782.pdfIn PDF document text
    • http://e-district.org/userfiles/file/74128211615.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/861760921.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/69272481684.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/69886131288.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/31626087011.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109161707429502.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc596f8a4---bejabo.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/sowogasonixe.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/53011771840.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109131606162403.pdfIn PDF document text
    • 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_off0000c0d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D2 16792 bytes
font_01_sfnt_off0000d8e4.bin
6337967de2c957219168f6e74dcfa79900f472d7910ffaa64c5fa422c9ffde2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E4 18804 bytes
font_02_sfnt_off0001093c.bin
4b30a138a9c1d8cd8508f15141a99caa08149b3385127a6c5071c8e9bfbe6a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 10788 bytes