Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb231b49afe04fa…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 17:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e35f164e1e845b87eee924c08394ab65 SHA-1: 9eead80084fdc56bce04ff834ebc20a8d3c21325 SHA-256: 8fb231b49afe04faef4d80893ebdf672710ee2f05a8802f95d38ffc9f5ca24ab
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm strategy. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://catamma.ru/uplcv?utm_term=boxing+scorecard+live PDF link annotation
    • http://web300k.com/upload/ck/files/zusugemuguwe.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/22534186543.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/38478788305.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/telekhdj3j2d0d2p18a8kf2fvb/15037216907.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614166f3d4adf---63515270362.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/bezamo.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/75493184133.pdfIn PDF document text
    • https://linker.tw/files/13585713010.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/dopawuwaxanevugogot.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/nomigubomiwat.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/92586189939.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/fjigugiv4enuhe5vcc33cjvj6h/tiramogojidoni.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/40932794301.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/32402704097.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/7944882164.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/98887742434.pdfIn PDF document text
    • http://1careglobal.com/upload/files/79246810266.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/70926035311.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/tufutikazefefijipuroj.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/31089231169.pdfIn PDF document text
    • https://ifunb.com/shopadmin/upload/files/7116347382.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/24536856153.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/lurujugisudajegixanogil.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/71609900456.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_off0000b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B1 17776 bytes
SHA-256: 3d2273a18e0cff2a98d9db4a3c2932281fe0c6f379250fe38ebc7862f0c790a1
font_01_sfnt_off0000dff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF3 10668 bytes
SHA-256: 31ec97bbb82421c7282088e0a5879343556d6e57f5ef5524faf7c406e42f1c80
font_02_sfnt_off0000f860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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