Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0b249af2c0a9aa…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 01:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2006c7e70da0694bb230e61cfa041fe SHA-1: d680e0fb78c5720bfc9a9bc44624bd89578353b6 SHA-256: 6c0b249af2c0a9aabaa71b494ed178f04da12f90a60c817163950d09a56104fc
196 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely a phishing or trojan delivery mechanism. The presence of a link farm and the use of compromised CMS uploads are common tactics for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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://aslimitada.com/userfiles/file/porijavabuvupimatevulanoj.pdf In PDF document text
    • http://thailaundry.com/imgUpload/files/9191633049.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/tikata.pdfIn PDF document text
    • http://change-sexy.com/files/files/jasafexoru.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0f10c0984aad1cf6cb7b803c84060ba/lusepezolelabufubikelag.pdfIn PDF document text
    • https://samudra99.com/contents//files/fimetedoxixizowimezeturi.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/vorirumizupeg.pdfIn PDF document text
    • http://it-hair.com/userfiles/tivamusitetego.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/40534133775.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb2a8fc8d---nufejam.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/sifavagef.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/pifijovabajam.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/mupikapuw.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/788606340.pdfIn PDF document text
    • http://daikinhbac.com/upload/files/nizapasaxegikavofunox.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/31519888881.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vb35i56b6d6r6k4kmd8ohoals1/wupakuw.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/52347484332.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/24023396217.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/023867aa6bbd92a1dd9c6849361e6b80/jileto.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108281010578380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=2020+army+reserve+pay+chartPDF 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 10600 bytes
SHA-256: 8547f5c0c58c8ae8099d2d364f44f8197ca57b5125a3a3483257d93e5165abaf
font_01_sfnt_off0000f2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FF 17684 bytes
SHA-256: cde8f57a448aa4f441d776e2784b0dfe3bc9ef91d507d2adc11d368d6a30ffb6
font_02_sfnt_off000120a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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