Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cacfb0fd03db30…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 11:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7386d278f12ecff2206cdbebd6baa649 SHA-1: 017b2f9214999cf14e171bbf6d9c6736922333e3 SHA-256: c6cacfb0fd03db30b23d6650bfc7692c6e67d2f7cabd44d5a19e0a579ef67b85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing lure, likely related to gift card offers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://noithatnhapkhaugiasi.com/luutru/files/milugetomiwuv.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e7bc73d45ab568b70ad845bb83da568f/xefaxosenamun.pdfIn PDF document text
    • http://linza-market.ru/upload/files/55673357751.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/1278484789.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130067eb4cbe---43565470905.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/53424299907.pdfIn PDF document text
    • http://berbun.com/user_img/file/gasamugedawanasesotaj.pdfIn PDF document text
    • http://bigbulkbags.com/survey/userfiles/files/3173435794.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/38542068414.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/lovarozi.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/73972673736.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/98128900192.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/tibijebivonopibivi.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109201134307633.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/gupipevajonosobatisozep.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/77765132745.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sedatexopileguw.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/77167844271.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/sinenamuzegazorizumo.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/kcd6u2svqhrhvgf4ratappcke5/fabusebifawalofolidoge.pdfIn PDF document text
    • http://keitbg.com/images/files/fogije.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/tuxenomesoxipibafoneti.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/27639423750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=%245+itunes+gift+card+codePDF 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_off0000b22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22B 17824 bytes
SHA-256: e659d5572214e323620ebb71ca65e5dcf00481e8c91384ddd4d307bdc86eda51
font_01_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 10948 bytes
SHA-256: 2b70fdde5225a067e416fcaf385e56af120c26e603f25eff94de4780c6445cfb